subject:(all optical switching)

University of Waterloo

1. Semnani, Behrooz. Graphene-Assisted Integrated Nonlinear Optics.

Degree: 2018, University of Waterloo

► ‎The unique linear and massless band structure of graphene in a purely two-dimensional Dirac fermionic structure has ignited intense research since the first monolayer graphene… (more)

▼ ‎The unique linear and massless band structure of graphene in a purely two-dimensional Dirac fermionic structure has ignited intense research since the first monolayer graphene was isolated in the laboratory‎. ‎Not only does it offer new inroads into low-dimensional physics; graphene exhibits several peculiar properties that promise to widen the realm of opportunities for integrated optics and photonics‎. ‎This thesis is an attempt to shed light on the exceptional nonlinear optical properties of graphene and their potential applications in integrated photonics‎. ‎Following a theoretical exploration of light-graphene interaction‎, ‎disruptive new insight into the nonlinear optics of graphene was generated‎. ‎It now appears that graphene can efficiently enable photon-photon interaction in a fully integrated fashion‎. ‎This property‎, ‎taken together with ultrawideband tunability and ultrafast carrier dynamics could be fully exploited within integrated photonics for a variety of applications including harmonic generation and all-optical signal processing‎. ‎The multidisciplinary work described herein combines theoretical modeling and experimentation to proceed one step further toward this goal‎. ‎This thesis begins by presenting a semiclassical theory of light-graphene interaction‎. ‎The emphasis is placed on the nonlinear optical response of graphene from the standpoint of its underlying chiral symmetry‎. ‎The peculiar energy‎- ‎momentum dispersion of the quasiparticles in graphene entails a diverging field-induced interband coupling‎. ‎Following a many-body study of the carrier relaxations dynamics in graphene‎, ‎it will be shown that the charged carriers in the vicinity of the Dirac point undergo an unconventional saturation effect that can be induced by an arbitrarily weak electromagnetic field‎. ‎The perturbative treatment of the optical response of graphene is revisited and a theoretical model is developed to estimate the nonlinear optical coefficients including the Kerr coefficient of graphene‎. ‎The theoretical models are complimented by the experimental results‎. ‎The peculiar nonlinear optical properties of graphene together with its ablity to being integrated with optical platforms would render it possible to perform nonlinear optics in graphene integrated nanophotonic structures‎. ‎Here‎, ‎the suitability of graphene for nonlinear optical applications is investigated both theoretically and experimentally‎. ‎The emphasis is placed on an on-chip platform for ultrafast all-optical amplitude modulation‎. ‎The experimental results indicate strong all-optical modulation in a graphene-cladded planar photonic crystal nanocavity‎. ‎This development relies heavily on the unique properties of graphene‎, ‎including its fast carrier dynamics and the special phonon induced relaxation mechanism‎. ‎Finally‎, ‎the potential application of graphene based all-optical modulation in time resolved nonlinear spectroscopy is also discussed‎.

Subjects/Keywords: Graphene; Nonlinear Optics; All-Optical Switching

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Semnani, B. (2018). Graphene-Assisted Integrated Nonlinear Optics. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/13034

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Semnani, Behrooz. “Graphene-Assisted Integrated Nonlinear Optics.” 2018. Thesis, University of Waterloo. Accessed April 11, 2021. http://hdl.handle.net/10012/13034.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Semnani, Behrooz. “Graphene-Assisted Integrated Nonlinear Optics.” 2018. Web. 11 Apr 2021.

Vancouver:

Semnani B. Graphene-Assisted Integrated Nonlinear Optics. [Internet] [Thesis]. University of Waterloo; 2018. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10012/13034.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Semnani B. Graphene-Assisted Integrated Nonlinear Optics. [Thesis]. University of Waterloo; 2018. Available from: http://hdl.handle.net/10012/13034

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Northeastern University

2. Cheng, Feng. Helicity-dependent all-optical switching in hybrid metal-ferromagnet structures for ultrafast magnetic data storage.

Degree: MS, Department of Electrical and Computer Engineering, 2016, Northeastern University

URL: http://hdl.handle.net/2047/D20236914

► The emerging Big Data era demands the rapidly increasing need for speed and capacity of storing and processing information. Standalone magnetic recording devices, such as… (more)

▼ The emerging Big Data era demands the rapidly increasing need for speed and capacity of storing and processing information. Standalone magnetic recording devices, such as hard disk drives (HDDs), have always been playing a central role in modern data storage and continuously advancing. Recognizing the growing capacity gap between the demand and production, industry has pushed the bit areal density in HDDs to 900 Giga-bit/square-inch, a remarkable 450-million-fold increase since the invention of the first hard disk drive in 1956. However, the further development of HDD capacity is facing a pressing challenge, the so-called superparamagnetic effect, that leads to the loss of information when a single bit becomes too small to preserve the magnetization[1, 2]. This requires new magnetic recording technologies that can write more stable magnetic bits into hard magnetic materials.; Recent research has shown that it is possible to use ultrafast laser pulses to switch the magnetization in certain types of magnetic thin films. Surprisingly, such a process does not require an externally applied magnetic field that always exists in conventional HDDs. Furthermore, the optically induced magnetization switching is extremely fast, up to sub-picosecond (10^-12 s) level, while with traditional recording method the deterministic switching does not take place shorter than 20 ps [3]. It's worth noting that the direction of magnetization is related to the helicity of the incident laser pulses. Namely, the right-handed polarized laser pulses will generate magnetization pointing in one direction while left-handed polarized laser pulses generate magnetization pointing in the other direction. This so-called helicity-dependent all-optical switching (HD-AOS) phenomenon can be potentially used in the next-generation of magnetic storage systems.; In this thesis, I explore the HD-AOS phenomenon in hybrid metal-ferromagnet structures, which consist of gold and Co/Pt multilayers. The experiment results show that such CoPtAu hybrid structures have stable HD-AOS phenomenon over a wild range of repetition rates and peak powers. A macroscopic three-temperature model is developed to explain the experiment results. In order to reduce the magnetic bit size and power consumption to transform future magnetic data storage techniques, I further propose plasmonic-enhanced all-optical switching (PE-AOS) by utilizing the unique properties of the tight field confinement and strong local field enhancement that arise from the excitation of surface plasmons supported by judiciously designed metallic nanostructures. The preliminary results on PE-AOS are presented. Finally, I provide a discussion on the future work to explore the underline mechanism of the HD-AOS phenomenon in hybrid metal-ferromagnetic thin films. Different materials and plasmonic nanostructures are also proposed as further work.

Subjects/Keywords: helicity-dependent all-optical switching; plasmonic-enhanced all-optical switching; hybrid metalferromagnetic thin films; Paramagnetism; Ferromagnetic materials; Thin films; Laser pulses, Ultrashort; Plasmons (Physics); Packet switching (Data transmission); Optical communications

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Cheng, F. (2016). Helicity-dependent all-optical switching in hybrid metal-ferromagnet structures for ultrafast magnetic data storage. (Masters Thesis). Northeastern University. Retrieved from http://hdl.handle.net/2047/D20236914

Chicago Manual of Style (16^th Edition):

Cheng, Feng. “Helicity-dependent all-optical switching in hybrid metal-ferromagnet structures for ultrafast magnetic data storage.” 2016. Masters Thesis, Northeastern University. Accessed April 11, 2021. http://hdl.handle.net/2047/D20236914.

MLA Handbook (7^th Edition):

Cheng, Feng. “Helicity-dependent all-optical switching in hybrid metal-ferromagnet structures for ultrafast magnetic data storage.” 2016. Web. 11 Apr 2021.

Vancouver:

Cheng F. Helicity-dependent all-optical switching in hybrid metal-ferromagnet structures for ultrafast magnetic data storage. [Internet] [Masters thesis]. Northeastern University; 2016. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/2047/D20236914.

Council of Science Editors:

Cheng F. Helicity-dependent all-optical switching in hybrid metal-ferromagnet structures for ultrafast magnetic data storage. [Masters Thesis]. Northeastern University; 2016. Available from: http://hdl.handle.net/2047/D20236914

3. Huttunen, Anu. Analysis and Optimization of Photonic Crystal Components for Optical Telecommunications.

Degree: 2005, Helsinki University of Technology

URL: http://lib.tkk.fi/Diss/2005/isbn9512277611/

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Photonic crystals are periodic dielectric structures where the period is of the same order of magnitude than the wavelength of light. As a result of… (more)

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Photonic crystals are periodic dielectric structures where the period is of the same order of magnitude than the wavelength of light. As a result of interference, there exist band gaps for light, i.e., light of certain range of frequencies is not allowed to exist inside the photonic crystal, which can be used to control and confine light. In this thesis, photonic crystals were studied with computer simulations and concepts of new components for optical telecommunications were proposed. An all-optical switch, based on the properties of a Kerr-nonlinear one-dimensional photonic crystal, was investigated. The band gap was shown to change as a function of light intensity inside the nonlinear photonic crystal. Thus, it performs an all-optical switching function, where one signal can be dynamically reflected depending on another signal. Two parallel waveguides in a two-dimensional photonic crystal were considered. In general, adjacent waveguides are coupled and a light pulse traveling in one waveguide will oscillate between the waveguides. We found complete decoupling between the waveguides for certain geometries. This can be utilized in integrated optics when cross-talk between contiguous channels is not desired. The band gap of a thin slab of two-dimensional photonic crystal was shown to depend strongly on the material on top/below the slab, and thus a new type of waveguide was proposed. Instead of the conventional defect waveguide, a waveguide can be made by patterning the photonic crystal slab by a suitable material. The waveguiding was shown to be due to band gap difference in some cases and due to average refractive index difference in others. Microstructure and dual-core fibers were optimized to achieve large negative dispersion and large mode area simultaneously. Negative dispersion fibers are needed for dispersion compensation and pulse compression. They usually have small mode areas and are highly nonlinear, which is a problem for high-intensity applications. This can be avoided with the fiber geometries proposed in this thesis. The effect of the wavelength dependence of gain, nonlinearity and dispersion to the propagation of short pulses in high-gain efficiency photonic crystal fiber amplifiers was studied. It resulted in asymmetric spectrum and chirp, and reduction of the pulse broadening. Wavelength dependence of the nonlinearity was demonstrated to have the most effect, compared to that of dispersion or gain.

Report / Helsinki University of Technology, Laboratory of Computational Engineering. B, ISSN 1455-0474; 51

Advisors/Committee Members: Helsinki University of Technology, Department of Electrical and Communications Engineering, Laboratory of Computational Engineering.

Subjects/Keywords: all-optical switching; photonic crystal waveguides; dispersion compensation; photonic crystal fiber amplifier

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APA (6^th Edition):

Huttunen, A. (2005). Analysis and Optimization of Photonic Crystal Components for Optical Telecommunications. (Thesis). Helsinki University of Technology. Retrieved from http://lib.tkk.fi/Diss/2005/isbn9512277611/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Huttunen, Anu. “Analysis and Optimization of Photonic Crystal Components for Optical Telecommunications.” 2005. Thesis, Helsinki University of Technology. Accessed April 11, 2021. http://lib.tkk.fi/Diss/2005/isbn9512277611/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Huttunen, Anu. “Analysis and Optimization of Photonic Crystal Components for Optical Telecommunications.” 2005. Web. 11 Apr 2021.

Vancouver:

Huttunen A. Analysis and Optimization of Photonic Crystal Components for Optical Telecommunications. [Internet] [Thesis]. Helsinki University of Technology; 2005. [cited 2021 Apr 11]. Available from: http://lib.tkk.fi/Diss/2005/isbn9512277611/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Huttunen A. Analysis and Optimization of Photonic Crystal Components for Optical Telecommunications. [Thesis]. Helsinki University of Technology; 2005. Available from: http://lib.tkk.fi/Diss/2005/isbn9512277611/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Georgia Tech

4. Shiring, Stephen B. A computational investigation into the third-order nonlinear optical properties of cyanine-like polymethines for all-optical switching applications.

Degree: PhD, Chemistry and Biochemistry, 2017, Georgia Tech

URL: http://hdl.handle.net/1853/60164

► Cyanine-like polymethines have recently attracted renewed attention for their potential as materials to realize all-optical switching applications by demonstrating large real and small imaginary parts… (more)

Subjects/Keywords: Cyanines; Polymethines; Computational; Theoretical; All-optical switching; Nonlinear optics; Charge-transfer compounds

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APA (6^th Edition):

Shiring, S. B. (2017). A computational investigation into the third-order nonlinear optical properties of cyanine-like polymethines for all-optical switching applications. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/60164

Chicago Manual of Style (16^th Edition):

Shiring, Stephen B. “A computational investigation into the third-order nonlinear optical properties of cyanine-like polymethines for all-optical switching applications.” 2017. Doctoral Dissertation, Georgia Tech. Accessed April 11, 2021. http://hdl.handle.net/1853/60164.

MLA Handbook (7^th Edition):

Shiring, Stephen B. “A computational investigation into the third-order nonlinear optical properties of cyanine-like polymethines for all-optical switching applications.” 2017. Web. 11 Apr 2021.

Vancouver:

Shiring SB. A computational investigation into the third-order nonlinear optical properties of cyanine-like polymethines for all-optical switching applications. [Internet] [Doctoral dissertation]. Georgia Tech; 2017. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1853/60164.

Council of Science Editors:

Shiring SB. A computational investigation into the third-order nonlinear optical properties of cyanine-like polymethines for all-optical switching applications. [Doctoral Dissertation]. Georgia Tech; 2017. Available from: http://hdl.handle.net/1853/60164

University of Louisville

5. Hoveyda Marashi, Faren. All-optical switching in ferromagnetic superlattices.

Degree: PhD, 2017, University of Louisville

URL: 10.18297/etd/2833 ; https://ir.library.louisville.edu/etd/2833

► The unexpected observation of ultrafast demagnetization (UDM) and subsequent time-resolved studies of laser-induced magnetization switching opened a new door to both fundamental physics and… (more)

▼ The unexpected observation of ultrafast demagnetization (UDM) and subsequent time-resolved studies of laser-induced magnetization switching opened a new door to both fundamental physics and technological applications of magnetic materials. All-optical switching (AOS) can be initiated faster than the precession limit, hinting to its potential in increasing the writing speed and data storage density. However, notwithstanding considerable research interest, the mechanism of AOS in ferromagnetic materials remained unclear. Ferromagnetic superlattices were deposited on glass substrates with e-beam evaporation and sputtering. Magnetization curves were measured in magneto-optical and vibrating sample magnetometer experiments. A femtosecond Ti:S laser was utilized in a writing setup to induce AOS in Co/Pd ferromagnetic superlattices at different fluences and beam polarizations. Magnetic force and polarizing microscopy were applied to image the magnetic structure and identify optimal AOS parameters. High-repetition rate pulses of the Ti:S laser resulted in heat accumulation in the samples. For a better understanding of the relation between temperature and domain wall motion, we solved the heat diffusion equation numerically. The solution for our sample displayed a tilted thermal wave front, consistent with the tilted magnetic domains observed. This supports our model of AOS, in which thermal forces acting on domain walls leads to their expansion and magnetization switching (chapter 3). Polarizing microscopy images also revealed a complementary pattern of magnetic domains after laser writing, suggesting that demagnetizing fields are not negligible. Furthermore, comparison of pump-probe UDM measurements with AOS writing measurements pointed to a demagnetized state before AOS emergence. This motivated us to apply micromagnetic simulations to investigate the time evolution of a demagnetized state and in particular the role of demagnetizing fields in the development of different final states. We show using this method that demagnetizing fields can nucleate and, together with thermally-induced forces, develop a switched state (chapter 4). Using the pump-probe setup, we measured the frequency dependence of laser-induced temperature modulations in Co/Au, Co/Ag and Co/Pd superlattices on glass substrates. Green's function solutions of the heat diffusion equation show that a glass layer with properties distinct from the glass substrate is present near the metallic superlattices (chapter 5). Advisors/Committee Members: Smadici, Serban, Jayanthi, Chakram, Jayanthi, Chakram, Sumanasekera, Gamini, Cohn, Robert.

Subjects/Keywords: all-optical switching; magnetization; magneto-optical effects; ultrafast demagnetization; pump-probe experiment; time-resolved study; Condensed Matter Physics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hoveyda Marashi, F. (2017). All-optical switching in ferromagnetic superlattices. (Doctoral Dissertation). University of Louisville. Retrieved from 10.18297/etd/2833 ; https://ir.library.louisville.edu/etd/2833

Chicago Manual of Style (16^th Edition):

Hoveyda Marashi, Faren. “All-optical switching in ferromagnetic superlattices.” 2017. Doctoral Dissertation, University of Louisville. Accessed April 11, 2021. 10.18297/etd/2833 ; https://ir.library.louisville.edu/etd/2833.

MLA Handbook (7^th Edition):

Hoveyda Marashi, Faren. “All-optical switching in ferromagnetic superlattices.” 2017. Web. 11 Apr 2021.

Vancouver:

Hoveyda Marashi F. All-optical switching in ferromagnetic superlattices. [Internet] [Doctoral dissertation]. University of Louisville; 2017. [cited 2021 Apr 11]. Available from: 10.18297/etd/2833 ; https://ir.library.louisville.edu/etd/2833.

Council of Science Editors:

Hoveyda Marashi F. All-optical switching in ferromagnetic superlattices. [Doctoral Dissertation]. University of Louisville; 2017. Available from: 10.18297/etd/2833 ; https://ir.library.louisville.edu/etd/2833

Université de Lorraine

6. Hadri, Mohammed Salah El. Magnetization reversal mechanism leading to all-optical helicity-dependent switching : Mécanisme de retournement d'aimantation entraînant le retournement tout-optique dépendant de l'hélicité.

Degree: Docteur es, Physique, 2016, Université de Lorraine

URL: http://www.theses.fr/2016LORR0107

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Le contrôle de l’aimantation sans application de champ magnétique externe est un domaine de recherche en plein essor, étant prometteur pour les applications technologiques d’enregistrement… (more)

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Le contrôle de l’aimantation sans application de champ magnétique externe est un domaine de recherche en plein essor, étant prometteur pour les applications technologiques d’enregistrement magnétique et de spintronique. En 2007, Stanciu et al. ont découvert la possibilité de retourner l’aimantation dans un film fait d’alliage ferrimagnétique de GdFeCo en utilisant des impulsions laser femtoseconde. Longtemps cantonné aux alliages de GdFeCo, ce retournement tout-optique s’avère un phénomène plus général, puisqu’il a été mesuré plus récemment dans une large variété de matériaux ferrimagnétiques et ferromagnétiques. Cette découverte a ainsi ouvert la voie à l’intégration de l’écriture tout-optique dans l’industrie des mémoires magnétiques. Néanmoins, l’ensemble des modèles théoriques expliquant le retournement tout-optique dans le GdFeCo ne semblent pas s’appliquer aux autres matériaux magnétiques, mettant ainsi en question l’unicité de l’origine microscopique de ce phénomène. Au cours de cette thèse, nous avons étudié la réponse aux impulsions laser femtoseconde des alliages ferrimagnétiques et des multicouches ferromagnétiques, dans l'objectif d'élucider divers aspects du mécanisme du retournement optique. Nous avons élucidé expérimentalement les paramètres magnétiques gouvernant le retournement tout-optique. Nous avons montré que l’observation du retournement tout-optique nécessite des domaines magnétiques plus grands que la taille du faisceau laser pendant le processus de refroidissement, un critère qui est commun à la fois aux matériaux ferrimagnétiques et ferromagnétiques. En outre, nous nous sommes intéressés à l’intégration du retournement tout-optique dans des dispositifs de spintronique. Grâce à une caractérisation temporelle de l’aimantation dans des croix de Hall via l’effet Hall extraordinaire, nous avons distingué entre deux types de mécanismes du retournement optique. Le premier type est un retournement purement thermique obtenu avec une impulsion unique dans les alliages ferrimagnétiques de GdFeCo, tandis que le deuxième type est un retournement cumulative et à deux régimes dans les alliages ferrimagnétiques de TbCo et les multicouches ferromagnétiques de Co/Pt. Ce dernier consiste en une formation indépendante de l’hélicité de multidomaines magnétiques suivie d'une ré-aimantation dépendante de l'hélicité sur plusieurs dizaines de millisecondes.

The control of magnetization without external magnetic fields is an emergent field of research due to the prospect of impacting many technological applications such as magnetic recording and spintronics. In 2007, Stanciu et al. discovered an intriguing new possibility to switch magnetization in a ferrimagnetic GdFeCo alloy film using femtosecond laser pulses. This all-optical switching of magnetization had long been restricted to GdFeCo alloys, though it turned out to be a more general phenomenon for a variety of ferromagnetic and ferromagnetic materials. This discovery paved the way for an integration of the all-optical writing in storage industries.…

Advisors/Committee Members: Mangin, Stéphane (thesis director), Malinowski, Grégory (thesis director).

Subjects/Keywords: Magnétisme; Spintronique; Retournement tout-Optique; Renversement de l’aimantation; Magnetism; Spintronics; All-Optical switching; Magnetization reversal; 537.5; 538.3

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hadri, M. S. E. (2016). Magnetization reversal mechanism leading to all-optical helicity-dependent switching : Mécanisme de retournement d'aimantation entraînant le retournement tout-optique dépendant de l'hélicité. (Doctoral Dissertation). Université de Lorraine. Retrieved from http://www.theses.fr/2016LORR0107

Chicago Manual of Style (16^th Edition):

Hadri, Mohammed Salah El. “Magnetization reversal mechanism leading to all-optical helicity-dependent switching : Mécanisme de retournement d'aimantation entraînant le retournement tout-optique dépendant de l'hélicité.” 2016. Doctoral Dissertation, Université de Lorraine. Accessed April 11, 2021. http://www.theses.fr/2016LORR0107.

MLA Handbook (7^th Edition):

Hadri, Mohammed Salah El. “Magnetization reversal mechanism leading to all-optical helicity-dependent switching : Mécanisme de retournement d'aimantation entraînant le retournement tout-optique dépendant de l'hélicité.” 2016. Web. 11 Apr 2021.

Vancouver:

Hadri MSE. Magnetization reversal mechanism leading to all-optical helicity-dependent switching : Mécanisme de retournement d'aimantation entraînant le retournement tout-optique dépendant de l'hélicité. [Internet] [Doctoral dissertation]. Université de Lorraine; 2016. [cited 2021 Apr 11]. Available from: http://www.theses.fr/2016LORR0107.

Council of Science Editors:

Hadri MSE. Magnetization reversal mechanism leading to all-optical helicity-dependent switching : Mécanisme de retournement d'aimantation entraînant le retournement tout-optique dépendant de l'hélicité. [Doctoral Dissertation]. Université de Lorraine; 2016. Available from: http://www.theses.fr/2016LORR0107

Université de Lorraine

7. Quessab, Yassine. Mechanism and size effects of helicity-dependent all-optical magnetization switching in ferromagnetic thin films : Mécanisme et effets de tailles du retournement tout-optique dans les couches minces ferromagnétiques.

Degree: Docteur es, Physique, 2018, Université de Lorraine

URL: http://www.theses.fr/2018LORR0116

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Pour des applications technologiques d’enregistrement magnétique de l’information à haute densité et vitesse d’écriture et de lecture ultra-rapide, les chercheurs se sont penchés vers des… (more)

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Pour des applications technologiques d’enregistrement magnétique de l’information à haute densité et vitesse d’écriture et de lecture ultra-rapide, les chercheurs se sont penchés vers des méthodes de manipulation de l’aimantation sans application de champ magnétique externe. Il a été découvert qu’il était possible de renverser de manière déterministe l’aimantation de plusieurs matériaux ferri- et ferro-magnétiques à l’aide uniquement d’impulsions laser ultracourtes polarisées circulairement. Ce retournement tout-optique s’est avéré être un processus cumulatif nécessitant plusieurs impulsions ultracourtes dans les matériaux ferromagnétiques. Notamment dans les multicouches (Co/Pt), le retournement tout-optique se fait en deux étapes : une désaimantation indépendamment de l’hélicité suivie d’une ré-aimantation dans une direction ou l’autre selon l’hélicité. Pour autant, le mécanisme à l’origine du rétablissement de l’ordre magnétique n’a pas été étudié jusqu’à présent. Dans cette thèse, nous avons étudié le mécanisme de renversement de l’aimantation dans les couches ferromagnétiques résultant de l’excitation par impulsions laser ultracourtes polarisées circulairement. Pour cela, nous étions intéressé par la réponse d’une paroi de domaine dans les couches minces de Pt/Co/Pt à la suite d’une excitation laser et en fonction de la polarisation de la lumière. Nous avons démontré la possibilité d’induire un déplacement tout-optique et déterministe d’une paroi de domaine. Nous montrons que la propagation de la paroi résulte de la compétition entre trois contributions : le gradient de température dû aux effets de chauffage par le laser, l’effet de l’hélicité de la lumière et les effets de piégeages de la paroi. Par ailleurs, par mesures expérimentales du dichroïsme circulaire, nous excluons un mécanisme purement thermique du déplacement de paroi. Ainsi nous confirmons que le retournement tout-optique des couches ferromagnétiques se fait par une nucléation suivie d’une ré-aimantation par propagation déterministe des parois de domaines selon l’hélicité. De plus, nous avons exploré la possibilité d’utiliser le retournement tout-optique dans des dispositifs spintroniques pour l’enregistrement de l’information à haute densité. Pour se faire, il est nécessaire d’étudier les effets de tailles du retournement lorsque le matériau est structuré en îlots à l’échelle du micro- ou nanomètre. Nous avons montré qu’un plus grand nombre d’impulsions laser est nécessaire afin de renverser l’aimantation de micro-disques comparés à la couche continue ferromagnétique. Il en résulte que le champ dipolaire aide le renversement de l’aimantation dans les couches continues rendant ainsi le retournement tout-optique énergétiquement plus favorable

Over the past decade, the demand for an even higher capacity to store data has been gradually increasing. To achieve ultrafast and ultrahigh density magnetic data storage, low-power methods to manipulate the magnetization without applying an external magnetic field has attracted growing attention. The…

Advisors/Committee Members: Mangin, Stéphane (thesis director).

Subjects/Keywords: Retournement tout-optique; Spintronique; Impulsions laser femtosecondes; Renversement de l’aimantation; All-optical switching; Spintronics; Femtosecond laser pulses; Magnetization reversal; 538.3

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Quessab, Y. (2018). Mechanism and size effects of helicity-dependent all-optical magnetization switching in ferromagnetic thin films : Mécanisme et effets de tailles du retournement tout-optique dans les couches minces ferromagnétiques. (Doctoral Dissertation). Université de Lorraine. Retrieved from http://www.theses.fr/2018LORR0116

Chicago Manual of Style (16^th Edition):

Quessab, Yassine. “Mechanism and size effects of helicity-dependent all-optical magnetization switching in ferromagnetic thin films : Mécanisme et effets de tailles du retournement tout-optique dans les couches minces ferromagnétiques.” 2018. Doctoral Dissertation, Université de Lorraine. Accessed April 11, 2021. http://www.theses.fr/2018LORR0116.

MLA Handbook (7^th Edition):

Quessab, Yassine. “Mechanism and size effects of helicity-dependent all-optical magnetization switching in ferromagnetic thin films : Mécanisme et effets de tailles du retournement tout-optique dans les couches minces ferromagnétiques.” 2018. Web. 11 Apr 2021.

Vancouver:

Quessab Y. Mechanism and size effects of helicity-dependent all-optical magnetization switching in ferromagnetic thin films : Mécanisme et effets de tailles du retournement tout-optique dans les couches minces ferromagnétiques. [Internet] [Doctoral dissertation]. Université de Lorraine; 2018. [cited 2021 Apr 11]. Available from: http://www.theses.fr/2018LORR0116.

Council of Science Editors:

Quessab Y. Mechanism and size effects of helicity-dependent all-optical magnetization switching in ferromagnetic thin films : Mécanisme et effets de tailles du retournement tout-optique dans les couches minces ferromagnétiques. [Doctoral Dissertation]. Université de Lorraine; 2018. Available from: http://www.theses.fr/2018LORR0116

Université de Lorraine

8. Vallobra, Pierre. Effects of interfacial interactions on optical switching in magnetic heterostructures : Effets des interactions d’interface sur le renversement optique dans des hétérostructures magnétiques.

Degree: Docteur es, Physique, 2019, Université de Lorraine

URL: http://www.theses.fr/2019LORR0015

►

Pendant les 20 dernières années, le nanomagnétisme a suscité un intérêt grandissant au sein de la communauté scientifique du fait de ses nombreuses applications pour… (more)

▼

Pendant les 20 dernières années, le nanomagnétisme a suscité un intérêt grandissant au sein de la communauté scientifique du fait de ses nombreuses applications pour les mémoires magnétiques. A l’échelle nanométrique beaucoup de propriétés des matériaux magnétiques découlent de leurs interfaces avec d’autres matériaux (magnétiques ou non). Cela explique l’omniprésence des hétérostructures composées de plusieurs couches d’épaisseur nanométrique dans le domaine du nanomagnétisme. Dans les hétérostructures que nous étudions, ces propriétés interfaciales sont le décalage d’échange, l’interaction Dzyaloshinskii-Moriya, l’anisotropie magnétique perpendiculaire et l’échange entre deux couches ferromagnétiques. D’abord nous étudions la modification du champ de décalage d’échange dans une bicouche [Pt/Co]xN/IrMn lorsque l’on l’expose à des impulsions laser de lumière polarisée circulairement. Nous montrons que le champ de décalage d’échange après exposition au laser résulte de la configuration du ferromagnétique [Pt/Co]xN. Nous étudions ensuite les conditions nécessaires à un retournement tout optique dépendant de l’hélicité d’un matériau ferrimagnétique de synthèse composé de deux couches de CoFeB /Pt /CoFeB et Co couplées antiferromagnétiquement et concluons que les facteurs clés qui gouvernent le renversement de l’aimantation totale sont les températures respectives des deux couches. Nous nous sommes aussi concentrés sur la propagation de parois de domaine de Néel de même chiralité stabilisées par interaction Dzyaloshinskii-Moriya dans des multicouches de [Pt/Co/Ni]N. Nous avons finalement démontré la possibilité de générer des bulles skyrmioniques par le laser femtoseconde

During the last 20 years, nanomagnetism has attracted a growing interest in the scientific community due to its multiple applications for magnetic memories. At the nanometer scale, many of the properties of the magnetic materials arise from their interfaces with other materials (magnetic or non-magnetic). This explains the omnipresence of heterostructures composed of several layers of thicknesses in the range of the nanometer in the field of nanomagnetism. In the heterostructures we study, those interfacial properties are the exchange bias, the Dzyaloshinskii-Moriya interaction, the perpendicular magnetic anisotropy and the interlayer exchange between two ferromagnetic layers. First we study the modification of the exchange bias field in a [Pt/Co]xN/IrMn bilayer when we expose it to laser pulses of a femtosecond circularly polarized light. We demonstrate that the final exchange bias field after laser pulses results from the magnetic configuration of the [Pt/Co]xN multilayer. We then study the conditions required for a helicity-dependent all optical switching of a synthetic ferromagnetic material composed of a CoFeB /Pt /CoFeB and a Co ferromagnetic layers coupled antiferromagnetically and conclude that the key factors that drive the switching of the total magnetization are the Curie temperatures of both layers. We focused also on the field-driven…

Advisors/Committee Members: Mangin, Stéphane (thesis director), Rojas-Sanchez, Juan Carlos (thesis director).

Subjects/Keywords: Retournement tout optique; Décalage d’échange; Interaction Dzyaloshinskii-Moriya; All optical switching; Exchange bias; Dzyaloshinskii-Moriya interaction; 538.3

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Vallobra, P. (2019). Effects of interfacial interactions on optical switching in magnetic heterostructures : Effets des interactions d’interface sur le renversement optique dans des hétérostructures magnétiques. (Doctoral Dissertation). Université de Lorraine. Retrieved from http://www.theses.fr/2019LORR0015

Chicago Manual of Style (16^th Edition):

Vallobra, Pierre. “Effects of interfacial interactions on optical switching in magnetic heterostructures : Effets des interactions d’interface sur le renversement optique dans des hétérostructures magnétiques.” 2019. Doctoral Dissertation, Université de Lorraine. Accessed April 11, 2021. http://www.theses.fr/2019LORR0015.

MLA Handbook (7^th Edition):

Vallobra, Pierre. “Effects of interfacial interactions on optical switching in magnetic heterostructures : Effets des interactions d’interface sur le renversement optique dans des hétérostructures magnétiques.” 2019. Web. 11 Apr 2021.

Vancouver:

Vallobra P. Effects of interfacial interactions on optical switching in magnetic heterostructures : Effets des interactions d’interface sur le renversement optique dans des hétérostructures magnétiques. [Internet] [Doctoral dissertation]. Université de Lorraine; 2019. [cited 2021 Apr 11]. Available from: http://www.theses.fr/2019LORR0015.

Council of Science Editors:

Vallobra P. Effects of interfacial interactions on optical switching in magnetic heterostructures : Effets des interactions d’interface sur le renversement optique dans des hétérostructures magnétiques. [Doctoral Dissertation]. Université de Lorraine; 2019. Available from: http://www.theses.fr/2019LORR0015

Université de Lorraine

9. Lambert, Charles-Henri. All-Optical Helicity dependent switching effect in magnetic thin films : Étude du retournement optique dépendant de l’hélicité dans des couches minces magnétiques.

Degree: Docteur es, Physique, 2015, Université de Lorraine

URL: http://www.theses.fr/2015LORR0091

►

Depuis une quinzaine d’années, de nombreuses solutions différentes ont été proposés afin de modifier l’aimantations de matériaux sans aucun champ magnétique extérieur appliqué. La manipulation… (more)

▼

Depuis une quinzaine d’années, de nombreuses solutions différentes ont été proposés afin de modifier l’aimantations de matériaux sans aucun champ magnétique extérieur appliqué. La manipulation d’aimantation à moindre coût énergétique, de préférence à des échelles de temps ultracourtes, est devenu un enjeu fondamental avec des implications pour les technologies d’enregistrement magnétique et de nouvelles sortes de stockage. Sur ce chemin, le type d’interaction découverte par Stanciu et al. ouvre la voie à l’utilisation de la lumière comme moyen d’exciter et de sonder directement les matériaux magnétiques. La description des théories et modèles existants dans ce domaine permet de nous rendre attentif sur les différents paramètres impliqués par l’interaction des lasers ultrarapides et matériaux magnétiques. L’entrelacement spécifique des impulsions de chaleur et de moment angulaire propre aux lasers ultrarapides est mise en avant afin de discuter de leur rôle dans les phénomènes observés. Le délai des interactions responsables de l’état final de l’aimantation est abordé et notamment la manière dont celle-ci ont un impact sur la façon dont le système se stabilise après une excitation laser. En outre, nous nous sommes intéressés à la relation entre les paramètres matériels et l’état final de l’aimantation obtenue avec un laser ultrarapide. Grâce aux nombreuses classes de matériaux magnétiques existantes les paramètres magnétiques peuvent être ajustés dans une grande gamme de valeurs et de manière entièrement contrôlés. Notre installation d’imagerie magnétique est alors capable de sonder les caractéristiques optiques et la stabilité des domaines après l’excitation. Nous avons finalement démontré que le retournement optique dépendent de l’hélicité peut être observée non seulement dans un grand nombre de couches minces d’alliages de terre rare-métaux de transition (RE-TM) mais aussi dans une variété beaucoup plus large de matériaux, y compris les multicouches et hétérostructures de RE-TM. Nous montrons en outre que les hétérostructures ferrimagnétiques dépourvues de terres rares présentent également un retournement optique. Nous avons en plus développé le contrôle optique de multicouches ferromagnétiques dont des films granulaires actuellement explorés pour l’enregistrement magnétique ultra-haute densité de demain. Notre découverte montre que la manipulation de l’aimantation dans des matériaux magnétiques est un phénomène beaucoup plus général que précédemment suspecté et peut avoir un impact majeur sur l’enregistrement magnétique et le stockage de l’information grâce à l’intégration nouvelle de ce type de contrôle optique dans des bits ferromagnétiques

The possibilities of modifying magnetization without applied magnetic fields have attracted growing attention over the past fifteen years. The low-power manipulation of magnetization, preferably at ultrashort timescales, has become a fundamental challenge with implications for future magnetic information memory and storage technologies. In particular the interplay of laser…

Advisors/Committee Members: Mangin, Stéphane (thesis director).

Subjects/Keywords: Électronique de spin; Transfert de spin; Magnétisme; Retournement Optique; Spintronics; Spin-Transfer; Magnetism; All-Optical Switching; 538.3

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APA (6^th Edition):

Lambert, C. (2015). All-Optical Helicity dependent switching effect in magnetic thin films : Étude du retournement optique dépendant de l’hélicité dans des couches minces magnétiques. (Doctoral Dissertation). Université de Lorraine. Retrieved from http://www.theses.fr/2015LORR0091

Chicago Manual of Style (16^th Edition):

Lambert, Charles-Henri. “All-Optical Helicity dependent switching effect in magnetic thin films : Étude du retournement optique dépendant de l’hélicité dans des couches minces magnétiques.” 2015. Doctoral Dissertation, Université de Lorraine. Accessed April 11, 2021. http://www.theses.fr/2015LORR0091.

MLA Handbook (7^th Edition):

Lambert, Charles-Henri. “All-Optical Helicity dependent switching effect in magnetic thin films : Étude du retournement optique dépendant de l’hélicité dans des couches minces magnétiques.” 2015. Web. 11 Apr 2021.

Vancouver:

Lambert C. All-Optical Helicity dependent switching effect in magnetic thin films : Étude du retournement optique dépendant de l’hélicité dans des couches minces magnétiques. [Internet] [Doctoral dissertation]. Université de Lorraine; 2015. [cited 2021 Apr 11]. Available from: http://www.theses.fr/2015LORR0091.

Council of Science Editors:

Lambert C. All-Optical Helicity dependent switching effect in magnetic thin films : Étude du retournement optique dépendant de l’hélicité dans des couches minces magnétiques. [Doctoral Dissertation]. Université de Lorraine; 2015. Available from: http://www.theses.fr/2015LORR0091

University of Pretoria

10. [No author]. An investigation into an all-optical 1x2 self-routed optical switch using parallel optical processing .

Degree: 2007, University of Pretoria

URL: http://upetd.up.ac.za/thesis/available/etd-01242006-115438/

► A unique all-optical 1x2 self-routed switch is introduced. This switch routes an optical packet from one input to one of two possible outputs. The header… (more)

Subjects/Keywords: All-optical packet switching; Parallel processing; Optical inverter; Optical switching; Optical networks; Optical packet switched networks; Optical header processing; UCTD

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APA (6^th Edition):

author], [. (2007). An investigation into an all-optical 1x2 self-routed optical switch using parallel optical processing . (Masters Thesis). University of Pretoria. Retrieved from http://upetd.up.ac.za/thesis/available/etd-01242006-115438/

Chicago Manual of Style (16^th Edition):

author], [No. “An investigation into an all-optical 1x2 self-routed optical switch using parallel optical processing .” 2007. Masters Thesis, University of Pretoria. Accessed April 11, 2021. http://upetd.up.ac.za/thesis/available/etd-01242006-115438/.

MLA Handbook (7^th Edition):

author], [No. “An investigation into an all-optical 1x2 self-routed optical switch using parallel optical processing .” 2007. Web. 11 Apr 2021.

Vancouver:

author] [. An investigation into an all-optical 1x2 self-routed optical switch using parallel optical processing . [Internet] [Masters thesis]. University of Pretoria; 2007. [cited 2021 Apr 11]. Available from: http://upetd.up.ac.za/thesis/available/etd-01242006-115438/.

Council of Science Editors:

author] [. An investigation into an all-optical 1x2 self-routed optical switch using parallel optical processing . [Masters Thesis]. University of Pretoria; 2007. Available from: http://upetd.up.ac.za/thesis/available/etd-01242006-115438/

University of Pretoria

11. Ingram, Riaan. An investigation into an all-optical 1x2 self-routed optical switch using parallel optical processing.

Degree: Electrical, Electronic and Computer Engineering, 2007, University of Pretoria

URL: http://hdl.handle.net/2263/24848

► A unique all-optical 1x2 self-routed switch is introduced. This switch routes an optical packet from one input to one of two possible outputs. The header… (more)

Subjects/Keywords: All-optical packet switching; Parallel processing; Optical inverter; Optical switching; Optical networks; Optical packet switched networks; Optical header processing; UCTD

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ingram, R. (2007). An investigation into an all-optical 1x2 self-routed optical switch using parallel optical processing. (Masters Thesis). University of Pretoria. Retrieved from http://hdl.handle.net/2263/24848

Chicago Manual of Style (16^th Edition):

Ingram, Riaan. “An investigation into an all-optical 1x2 self-routed optical switch using parallel optical processing.” 2007. Masters Thesis, University of Pretoria. Accessed April 11, 2021. http://hdl.handle.net/2263/24848.

MLA Handbook (7^th Edition):

Ingram, Riaan. “An investigation into an all-optical 1x2 self-routed optical switch using parallel optical processing.” 2007. Web. 11 Apr 2021.

Vancouver:

Ingram R. An investigation into an all-optical 1x2 self-routed optical switch using parallel optical processing. [Internet] [Masters thesis]. University of Pretoria; 2007. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/2263/24848.

Council of Science Editors:

Ingram R. An investigation into an all-optical 1x2 self-routed optical switch using parallel optical processing. [Masters Thesis]. University of Pretoria; 2007. Available from: http://hdl.handle.net/2263/24848

Universitat Politècnica de Catalunya

12. Santos Blanco, María Concepción. Optical solitons in quadratic nonlinear media and applications to all-optical switching and routing devices.

Degree: Departament de Teoria del Senyal i Comunicacions, 1998, Universitat Politècnica de Catalunya

URL: http://hdl.handle.net/10803/6913

► This thesis is a comprehensive study of the fundamental properties of a specific kind of optical spatial solitary waves. First observed experimentally in 1995, these… (more)

▼ This thesis is a comprehensive study of the fundamental properties of a specific kind of optical spatial solitary waves. First observed experimentally in 1995, these solitary waves are formed by an optical beam at a fundamental frequency and its second harmonic which propagate together and are mutually entangled; and are due to a balanced interplay between the beams' linear diffraction and a second-order nonlinear susceptibility of the medium. They are thereby referred as 'Optical Solitons in Quadratic Nonlinear Media' or simply 'Quadratic Solitons', They are also known as 'Multicolor Solitons' recalling that they are formed by beams at different frequencies. A quadratic nonlinear media needs to be non centrosymmetric which is a special kind of anisotropy. A great deal of quadratic nonlinear materials (the most used by industry such as lithim niobate, KTP, etc.) are uniaxial meaning that they feature a symmetry axis known as 'optical axis'. The direction of propagation of an optical beam relative to that axis determines the characteristics of the beam's propagation through the quadratic nonlinear material. A main result of that in some configurations of interest is a walk-off suffered by the beam as it enters the quadratic material. The properties of the families of quadratic solitons in the presence of a linear walk-off (quadratic walking solitons) are studied as well in the thesis stating that there is a relationship between the power injected into the medium and the walking angle, suitable to applications of all-optical switching and routing. An important last part of the thesis is devoted to the study from a practical viewpoint and through extensive numerical experiments of the potential of these solitary waves as the basis of practical all-optical switches and routers which could take the all-optical transparent network to a reality. The experiments have allowed to identify several configurations of interest with power level and dimensions suited to practical applications which could allow the production of commercial all-optical switching and routing devices based on quadratic solitons. Advisors/Committee Members: [email protected] (authoremail), false (authoremailshow), Torner i Sabata, Lluís (director).

Subjects/Keywords: spatial solitons; walking solitons; all-optical routing; all-optical switching; multicolor solitons; quadratic solitons; optical solitons; solitary waves; solitons; 621.3

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APA (6^th Edition):

Santos Blanco, M. C. (1998). Optical solitons in quadratic nonlinear media and applications to all-optical switching and routing devices. (Thesis). Universitat Politècnica de Catalunya. Retrieved from http://hdl.handle.net/10803/6913

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Santos Blanco, María Concepción. “Optical solitons in quadratic nonlinear media and applications to all-optical switching and routing devices.” 1998. Thesis, Universitat Politècnica de Catalunya. Accessed April 11, 2021. http://hdl.handle.net/10803/6913.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Santos Blanco, María Concepción. “Optical solitons in quadratic nonlinear media and applications to all-optical switching and routing devices.” 1998. Web. 11 Apr 2021.

Vancouver:

Santos Blanco MC. Optical solitons in quadratic nonlinear media and applications to all-optical switching and routing devices. [Internet] [Thesis]. Universitat Politècnica de Catalunya; 1998. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10803/6913.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Santos Blanco MC. Optical solitons in quadratic nonlinear media and applications to all-optical switching and routing devices. [Thesis]. Universitat Politècnica de Catalunya; 1998. Available from: http://hdl.handle.net/10803/6913

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universitat Politècnica de València

13. Martínez Canet, Josep Manuel. Photonic logic-gates: boosting all-optical header processing in future packet-switched networks .

Degree: 2008, Universitat Politècnica de València

URL: http://hdl.handle.net/10251/1874

► Las redes ópticas de paquetes se han convertido en los últimos años en uno de los temas de vanguardia en el campo de las tecnologías… (more)

▼ Las redes ópticas de paquetes se han convertido en los últimos años en uno de los temas de vanguardia en el campo de las tecnologías de comunicaciones. El procesado de cabeceras es una de las funciones más importantes que se llevan a cabo en nodos intermedios, donde un paquete debe ser encaminado a su destino correspondiente. El uso de tecnología completamente óptica para las funciones de encaminamiento y reconocimiento de cabeceras reduce el retardo de procesado respecto al procesado eléctrico, disminuyendo de ese modo la latencia en el enlace de comunicaciones. Existen diferentes métodos de procesado de datos para implementar el reconocimiento de cabeceras. El objetivo de este trabajo es la propuesta de una nueva arquitectura para el procesado de cabeceras basado en el uso de puertas lógicas completamente ópticas. Estas arquitecturas tienen como elemento clave el interferómetro Mach-Zehnder basado en el amplificador óptico de semiconductor (SOA-MZI), y utilizan el efecto no lineal de modulación cruzada de fase (XPM) en los SOAs para realizar dicha funcionalidad. La estructura SOA-MZI con XPM es una de las alternativas más atractivas debido a las numerosas ventajas que presenta, como por ejemplo los requisitos de baja energía para las señales de entrada, su diseño compacto, una elevada relación de extinción (ER), regeneración de la señal y el bajo nivel de chirp que introducen. Este trabajo se ha centrado en la implementación de la funcionalidad lógica XOR. Mediante esta función se pueden realizar diversas funcionalidades en las redes ópticas. Se proponen dos esquemas para el reconocimiento de cabeceras basados en el uso de la puerta XOR. El primer esquema utiliza puertas en cascada. El segundo esquema presenta una arquitectura muy escalable, y se basa en el uso de un bucle de realimentación implementado a la salida de la puerta. Asimismo, también se presentan algunas aplicaciones del procesado de cabeceras para el encaminamiento de paquetes basadas en el uso d Advisors/Committee Members: Ramos Pascual, Francisco (advisor).

Subjects/Keywords: Interferometers; Packet-switching; All-optical; Logic; Gates; Header/label; Xor; Networks; Soa-mzi

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APA (6^th Edition):

Martínez Canet, J. M. (2008). Photonic logic-gates: boosting all-optical header processing in future packet-switched networks . (Doctoral Dissertation). Universitat Politècnica de València. Retrieved from http://hdl.handle.net/10251/1874

Chicago Manual of Style (16^th Edition):

Martínez Canet, Josep Manuel. “Photonic logic-gates: boosting all-optical header processing in future packet-switched networks .” 2008. Doctoral Dissertation, Universitat Politècnica de València. Accessed April 11, 2021. http://hdl.handle.net/10251/1874.

MLA Handbook (7^th Edition):

Martínez Canet, Josep Manuel. “Photonic logic-gates: boosting all-optical header processing in future packet-switched networks .” 2008. Web. 11 Apr 2021.

Vancouver:

Martínez Canet JM. Photonic logic-gates: boosting all-optical header processing in future packet-switched networks . [Internet] [Doctoral dissertation]. Universitat Politècnica de València; 2008. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10251/1874.

Council of Science Editors:

Martínez Canet JM. Photonic logic-gates: boosting all-optical header processing in future packet-switched networks . [Doctoral Dissertation]. Universitat Politècnica de València; 2008. Available from: http://hdl.handle.net/10251/1874

14. Gieseking, Rebecca Lynn. Third-order nonlinear optical properties of polymethine-based materials: a theoretical investigation.

Degree: PhD, Chemistry and Biochemistry, 2015, Georgia Tech

URL: http://hdl.handle.net/1853/53570

► Organic π-conjugated molecules and materials with large real parts and small imaginary parts of the third-order polarizability are of great interest for all-optical switching applications.… (more)

Subjects/Keywords: Polymethines; Cyanines; Computational; Theoretical; Nonlinear optics; All-optical switching

…160 ix LIST OF FIGURES Figure 1.1. Illustration of all-optical switching (AOS)… …order polarizability are of great interest for all-optical switching applications. In this… …rates, it is necessary to perform the switching through an all-optical switching (AOS… …187 xv LIST OF ABBREVIATIONS ACN Acetonitrile AOS All-optical switch(ing)… …and the output signal will be close to zero. Figure 1.1. Illustration of all-optical…

11 more images…

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APA (6^th Edition):

Gieseking, R. L. (2015). Third-order nonlinear optical properties of polymethine-based materials: a theoretical investigation. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/53570

Chicago Manual of Style (16^th Edition):

Gieseking, Rebecca Lynn. “Third-order nonlinear optical properties of polymethine-based materials: a theoretical investigation.” 2015. Doctoral Dissertation, Georgia Tech. Accessed April 11, 2021. http://hdl.handle.net/1853/53570.

MLA Handbook (7^th Edition):

Gieseking, Rebecca Lynn. “Third-order nonlinear optical properties of polymethine-based materials: a theoretical investigation.” 2015. Web. 11 Apr 2021.

Vancouver:

Gieseking RL. Third-order nonlinear optical properties of polymethine-based materials: a theoretical investigation. [Internet] [Doctoral dissertation]. Georgia Tech; 2015. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1853/53570.

Council of Science Editors:

Gieseking RL. Third-order nonlinear optical properties of polymethine-based materials: a theoretical investigation. [Doctoral Dissertation]. Georgia Tech; 2015. Available from: http://hdl.handle.net/1853/53570

Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ)

15. Σπυροπούλου, Μαρία. Αμιγώς οπτικά συστήματα ημιαγώγιμων οπτικών ενισχυτών για δρομολόγηση σε υψίρρυθμα οπτικά δίκτυα μεταγωγής.

Degree: 2013, Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ)

URL: http://hdl.handle.net/10442/hedi/30193

►

The deployment of optical communication networks that support the emerging bandwidth demanding applications relies on the evolution of photonic integration technology. Photonic integrated circuits comprise… (more)

▼

The deployment of optical communication networks that support the emerging bandwidth demanding applications relies on the evolution of photonic integration technology. Photonic integrated circuits comprise the fundamental building blocks that promise to exploit the outmost of the speed of light by replacing their electronic counterparts that are used for signal processing and data forwarding at an intermediate transmission node. The main objective of this PhD thesis is the design and the investigation of all-optical SOA-based signal processing circuits for operation in high speed packet-switched networks. SOAs used in interferometric configurations (SOA-MZIs) have attracted much attention for the realization of all-optical signal processing functionalities like wavelength conversion, 2R regeneration, packet envelope detection and clock recovery, comprising complex photonic circuits. In the framework of this work, an analytical theoretical model was developed describing the SOA-MZI transfer function in the frequency domain, in order to evaluate the performance of the above network functionalities with respect to the SOA physical properties and its operational speed capabilities. The theoretical model relies on simplified mathematical expressions based on first-order perturbation theory approximations, yielding operation independent of the data type and modulation format. Hence, it is possible to design the response of optical components with desired properties as part of more complex circuits, which is very important for the development of photonic integrated circuits with high integration densities. The theoretical SOA-MZI transfer function was experimentally verified for different operating regimes that correspond to packet envelop detection, clock recovery and wavelength conversion. The theoretical model was also used as a tool for evaluating three different SOA-MZI all-optical wavelength conversion circuits: a) standard scheme, b) bidirectional scheme and c) differentially biased scheme. The theoretical results are verified experimentally at 40 Gb/s. In the second part of this PhD thesis, all-optical packet clock recovery functionality was investigated exploiting the non-linear properties of QD-SOAs and the size distribution of quantum dots exhibiting a number of advantages with respect to their bulk counterparts. The proposed circuit is capable of multi-wavelength operation on a per packet basis, owing to the discrete spectral regions that lie under the inhomogeneous gain profile of the QD-SOA and act as independent signal processing units for every input wavelength that is confined therein. The performance of the QD-SOA-based circuit for clock recovery on a per packet and a per wavelength basis was investigated through numerical simulations in Matlab at 40 Gb/s and 160 Gb/s and then it was experimentally evaluated at 40 Gb/s.

Η εξέλιξη των οπτικών δικτύων ώστε να υποστηρίζουν τις σύγχρονες απαιτήσεις σε εύρος ζώνης που επιτάσσει η σημερινή εποχή στηρίζεται στην ανάπτυξη της φωτονικής τεχνολογίας. Τα…

Subjects/Keywords: Οπτικά δίκτυα μεταγωγής πακέτων; Αμιγώς οπτική επεξεργασία σήματος; Οπτικός ενισχυτής ημιαγωγού; Ημιαγώγιμες κβαντκές τελείες; Συμβολόμετρο Mach Zehnder; Μετατροπή μήκους κύματος; Οπτική αναγέννηση; Οπτική ανάκτηση ρολογιού; Ανίχνευση περιβάλλουσας πακέτου; Φωτονική ολοκλήρωση; Optical packet switching; All optical signal processing; Semiconductor optical amplifiers; Semiconductor quantum dots; Mach Zehnder interferometer; Wavelength conversion; Optical regeneration; Optical clock recovery; Packet envelope detection; Photonic integration

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Σπυροπούλου, . �. (2013). Αμιγώς οπτικά συστήματα ημιαγώγιμων οπτικών ενισχυτών για δρομολόγηση σε υψίρρυθμα οπτικά δίκτυα μεταγωγής. (Thesis). Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ). Retrieved from http://hdl.handle.net/10442/hedi/30193

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Σπυροπούλου, Μαρία. “Αμιγώς οπτικά συστήματα ημιαγώγιμων οπτικών ενισχυτών για δρομολόγηση σε υψίρρυθμα οπτικά δίκτυα μεταγωγής.” 2013. Thesis, Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ). Accessed April 11, 2021. http://hdl.handle.net/10442/hedi/30193.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Σπυροπούλου, Μαρία. “Αμιγώς οπτικά συστήματα ημιαγώγιμων οπτικών ενισχυτών για δρομολόγηση σε υψίρρυθμα οπτικά δίκτυα μεταγωγής.” 2013. Web. 11 Apr 2021.

Vancouver:

Σπυροπούλου �. Αμιγώς οπτικά συστήματα ημιαγώγιμων οπτικών ενισχυτών για δρομολόγηση σε υψίρρυθμα οπτικά δίκτυα μεταγωγής. [Internet] [Thesis]. Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); 2013. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10442/hedi/30193.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Σπυροπούλου �. Αμιγώς οπτικά συστήματα ημιαγώγιμων οπτικών ενισχυτών για δρομολόγηση σε υψίρρυθμα οπτικά δίκτυα μεταγωγής. [Thesis]. Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); 2013. Available from: http://hdl.handle.net/10442/hedi/30193

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universitat Politècnica de Catalunya

16. Xu, Zhiyong. All-optical soliton control in photonic lattices.

Degree: Departament de Teoria del Senyal i Comunicacions, 2007, Universitat Politècnica de Catalunya

URL: http://hdl.handle.net/10803/6907

► Optical solitons are light packets (beams and/or pulses) that do not broaden because of the proper balance between diffraction/dispersion and nonlinearity. They propagate and interact… (more)

▼ Optical solitons are light packets (beams and/or pulses) that do not broaden because of the proper balance between diffraction/dispersion and nonlinearity. They propagate and interact with one another while displaying properties that are normally associated with real particles. The properties of optical solitons in optical fibers and crystals have been investigated comprehensively during the last two decades. However, solitons in optical lattices, which might be used for all-optical signal processing and routing have recently emerged a new area of research. The main objective of this thesis is the investigation of new techniques for soliton control in nonlinear media with/without an imprinted optical lattice. Chapter 2 focuses on properties of optical solitons in quadratic nonlinear media. The first section presents in detail the existence and stability of three representative families of two-dimensional spatiotemporal solitons in quadratic nonlinear waveguide arrays. It is assumed in addition to the temporal dispersion of the pulse, the combination of discrete diffraction that arises because of the weak coupling between neighboring waveguides. The other section reports on the existence and stability of multicolor lattice vortex solitons, which comprise four main humps arranged in a square configuration. It is also investigated the possibility of their dynamical generation from Gaussian-type input beams with nested vortices. The technique of optical lattice induction opens a wealth of opportunities for creation of waveguiding configurations with various nondiffracting light beams. Chapter 3 puts forward the concept of reconfigurable structures optically induced by mutually incoherent nondiffracting Bessel beams in Kerr-type nonlinear media. Two-core couplers are introduced and it is shown how to tune the switching properties of such structures by varying the intensity of the Bessel beams. The chapter also discusses various switching scenarios for solitons launched into the multi core directional couplers optically-induced by suitable arrays of Bessel beams. Furthermore, propagation of solitons is investigated in reconfigurable two-dimensional networks induced optically by arrays of nondiffracting Bessel beams. It is shown that broad soliton beams can move across networks with different topologies almost without radiation losses. Finally, properties of X-junctions are studied, which are created with two intersecting Bessel beams. Nonlocal response of nonlinear media can play an important role in properties of solitons. Chapter 4 treats the impact of nonlocality in the physical features exhibited by solitons supported by Kerr-type nonlinear media with an imprinted optical lattice. The chapter investigates properties of different families of lattice solitons in nonlocal nonlinear media. It is shown that the nonlocality of the nonlinear response can profoundly affect the soliton mobility. The properties of gap solitons are also discussed for photorefractive crystals with an asymmetric nonlocal diffusion… Advisors/Committee Members: [email protected] (authoremail), false (authoremailshow), Torner i Sabata, Lluís (director).

Subjects/Keywords: optical induced lattices; nonlinear materials; nonlocal; òptica no lineal - nonlinear optics; spatial solitons; all-optical switching devices; 621.3

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Xu, Z. (2007). All-optical soliton control in photonic lattices. (Thesis). Universitat Politècnica de Catalunya. Retrieved from http://hdl.handle.net/10803/6907

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Xu, Zhiyong. “All-optical soliton control in photonic lattices.” 2007. Thesis, Universitat Politècnica de Catalunya. Accessed April 11, 2021. http://hdl.handle.net/10803/6907.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Xu, Zhiyong. “All-optical soliton control in photonic lattices.” 2007. Web. 11 Apr 2021.

Vancouver:

Xu Z. All-optical soliton control in photonic lattices. [Internet] [Thesis]. Universitat Politècnica de Catalunya; 2007. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10803/6907.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Xu Z. All-optical soliton control in photonic lattices. [Thesis]. Universitat Politècnica de Catalunya; 2007. Available from: http://hdl.handle.net/10803/6907

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

17. Κεχαγιάς, Ευστράτιος. Ευρυζωνικά φωτονικά δίκτυα επόμενης γενιάς με διαφάνεια στον τύπο διαμόρφωσης και στην κίνηση πληροφορίας.

Degree: 2007, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)

URL: http://hdl.handle.net/10442/hedi/16946

►

This Ph.D. thesis was carried out during the period 2002-2007 at the Photonics Communications Research Laboratory, School of Electrical & Computer Engineering, National Technical University… (more)

▼

This Ph.D. thesis was carried out during the period 2002-2007 at the Photonics Communications Research Laboratory, School of Electrical & Computer Engineering, National Technical University of Athens, under the supervision of Associate Professor Hercules Avramopoulos. The aim of the present Ph.D. is the design of next-generation optical node architectures and the design and implementation of the optical sub-systems comprising these optical nodes. The developed optical sub-systems exploit optical signal processing techniques, whereas the fundamental building block of each sub-system is the interferometric optical gate that allows for high-speed operation and bit-rate independent power consumption. An integral part of the research focused on the identification and implementation of layer-2 and layer-3 network functionalities directly in the optical domain, contributing towards a more intelligent and efficient physical layer. The design and demonstration of advanced network functionalities was achieved through functional system-level integration of cascaded optical gates and flip-flops giving rise to the first intelligent all-optical sub-systems. Within the frames of the Ph.D., the use of photonic integrated optical devices, allowed for the demonstration of more advanced and key network functionalities, including all-optical packet-based clock recovery, packet envelope detection, label/payload separation, optical latching and all-optical packet routing. An important attribute of the designed sub-systems is their capability to operate transparently to packet-format and network-traffic. For the first time, sub-systems capable of processing both RZ and NRZ modulated packets that have variable length and variable spacing was demonstrated, exploiting time-of-flight processing and combination of bit-by-bit and packet-to-packet processing capabilities of all-optical gates. In the final stage of the Ph.D., all-optical node and network architectures were studied, in order to investigate the degree of intelligence that can be achieved in the optical layer. A self-routing node and network was designed and theoretically modeled that can achieve high bit-rate operation and high transmission efficiency even for packets with small size, verifying that the node can contribute towards the realization of highly granular and flexible future optical networks.

Το ερευνητικό έργο της παρούσας διατριβής έχει ως στόχο τη μελέτη και τη σχεδίαση οπτικών κόμβων επόμενης γενιάς. Συγκεκριμένα, μελετήθηκαν και σχεδιάστηκαν τα οπτικά υποσυστήματα που θα αποτελέσουν τους κόμβους ενός οπτικού δικτύου, οι αρχιτεκτονικές των κόμβων αυτών, καθώς και η αποδοτικότητα δικτυακών τοπολογιών βασισμένων στους εν λόγω κόμβους. Για την επίτευξη των επιμέρους δικτυακών λειτουργιών στα σχεδιαζόμενα υποσυστήματα χρησιμοποιήθηκαν τεχνικές αμιγούς οπτικής επεξεργασίας σήματος, με το βασικό δομικό στοιχείο των υποσυστημάτων να είναι ο υψίρρυθμης λειτουργίας οπτικός συμβολομετρικός διακόπτης. Στα πλαίσια της διατριβής, υλοποιήθηκαν αμιγώς οπτικά υποσυστήματα που…

Subjects/Keywords: Επικοινωνίες οπτικών ινών; Οπτικά δίκτυα; Οπτική αυτό-δρομολόγηση; Οπτική εναλλαγή ετικέτας; Οπτική επεξεργασία σήματος; Οπτική μεταγωγή πακέτων; Οπτική δρομολόγηση; Οπτικοί μανταλωτές; Optical fiber communications; Photonic networks; All-optical self-routing; All-optical label swapping; Optical signal processing; Optical switching; All-optical routing; Optical flip-flops

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Κεχαγιάς, . �. (2007). Ευρυζωνικά φωτονικά δίκτυα επόμενης γενιάς με διαφάνεια στον τύπο διαμόρφωσης και στην κίνηση πληροφορίας. (Thesis). National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Retrieved from http://hdl.handle.net/10442/hedi/16946

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Κεχαγιάς, Ευστράτιος. “Ευρυζωνικά φωτονικά δίκτυα επόμενης γενιάς με διαφάνεια στον τύπο διαμόρφωσης και στην κίνηση πληροφορίας.” 2007. Thesis, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Accessed April 11, 2021. http://hdl.handle.net/10442/hedi/16946.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Κεχαγιάς, Ευστράτιος. “Ευρυζωνικά φωτονικά δίκτυα επόμενης γενιάς με διαφάνεια στον τύπο διαμόρφωσης και στην κίνηση πληροφορίας.” 2007. Web. 11 Apr 2021.

Vancouver:

Κεχαγιάς �. Ευρυζωνικά φωτονικά δίκτυα επόμενης γενιάς με διαφάνεια στον τύπο διαμόρφωσης και στην κίνηση πληροφορίας. [Internet] [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2007. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10442/hedi/16946.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Κεχαγιάς �. Ευρυζωνικά φωτονικά δίκτυα επόμενης γενιάς με διαφάνεια στον τύπο διαμόρφωσης και στην κίνηση πληροφορίας. [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2007. Available from: http://hdl.handle.net/10442/hedi/16946

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Georgia Tech

18. Shell, Michael David. Cascaded All-Optical Shared-Memory Architecture Packet Switches Using Channel Grouping Under Bursty Traffic.

Degree: PhD, Electrical and Computer Engineering, 2004, Georgia Tech

URL: http://hdl.handle.net/1853/4892

► This work develops an exact logical operation model to predict the performance of the all-optical shared-memory architecture (OSMA) class of packet switches and provides a… (more)

▼ This work develops an exact logical operation model to predict the performance of the all-optical shared-memory architecture (OSMA) class of packet switches and provides a means to obtain a reasonable approximation of OSMA switch performance within certain types of networks, including the Banyan family. All-optical packet switches have the potential to far exceed the bandwidth capability of their current electronic counterparts. However, all-optical switching technology is currently not mature. Consequently, all-optical switch fabrics and buffers are more constrained in size and can cost several orders of magnitude more than those of electronic switches. The use of shared-memory buffers and/or links with multiple parallel channels (channel grouping) have been suggested as ways to maximize switch performance with buffers of limited size. However, analysis of shared-memory switches is far more difficult than for other commonly used buffering strategies. Obtaining packet loss performance by simulation is often not a viable alternative to modeling if low loss rates or large networks are encountered. Published models of electronic shared-memory packet switches (ESMP) have primarily involved approximate models to allow analysis of switches with a large number of ports and/or buffer cells. Because most ESMP models become inaccurate for small switches, and OSMA switches, unlike ESMP switches, do not buffer packets unless contention occurs, existing ESMP models cannot be applied to OSMA switches. Previous models of OSMA switches were confined to isolated (non-networked), symmetric OSMA switches using channel grouping under random traffic. This work is far more general in that it also encompasses OSMA switches that (1) are subjected to bursty traffic and/or with input links that have arbitrary occupancy probability distributions, (2) are interconnected to form a network and (3) are asymmetric. Advisors/Committee Members: Joseph L. A. Hughes (Committee Chair), Henry L. Owen (Committee Member), John A. Copeland (Committee Member), Richard M. Fujimoto (Committee Member), W. Russell Callen (Committee Member).

Subjects/Keywords: Packet switching; Optical buffering; Networks; Markov models; Channel grouping; Bursty traffic; Banyan networks; Asymmetric; Analytical modeling; All-optical networks; Shared-memory switches; Optical data processing; Packet switching (Data transmission) Mathematical models; Computer networks; Markov processes; Optical communications

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Shell, M. D. (2004). Cascaded All-Optical Shared-Memory Architecture Packet Switches Using Channel Grouping Under Bursty Traffic. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/4892

Chicago Manual of Style (16^th Edition):

Shell, Michael David. “Cascaded All-Optical Shared-Memory Architecture Packet Switches Using Channel Grouping Under Bursty Traffic.” 2004. Doctoral Dissertation, Georgia Tech. Accessed April 11, 2021. http://hdl.handle.net/1853/4892.

MLA Handbook (7^th Edition):

Shell, Michael David. “Cascaded All-Optical Shared-Memory Architecture Packet Switches Using Channel Grouping Under Bursty Traffic.” 2004. Web. 11 Apr 2021.

Vancouver:

Shell MD. Cascaded All-Optical Shared-Memory Architecture Packet Switches Using Channel Grouping Under Bursty Traffic. [Internet] [Doctoral dissertation]. Georgia Tech; 2004. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1853/4892.

Council of Science Editors:

Shell MD. Cascaded All-Optical Shared-Memory Architecture Packet Switches Using Channel Grouping Under Bursty Traffic. [Doctoral Dissertation]. Georgia Tech; 2004. Available from: http://hdl.handle.net/1853/4892

19. Mariana Massimino Feres. Estudo de algoritmos RWA em redes GMPLS sobre DWDM.

Degree: 2009, Universidade Federal de São Carlos

URL: http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=3610

►

O aumento de usuários e o surgimento de aplicações de redes sofisticadas impulsionam as pesquisas para aprimorar as tecnologias de transmissão de dados, e assim… (more)

▼

O aumento de usuários e o surgimento de aplicações de redes sofisticadas impulsionam as pesquisas para aprimorar as tecnologias de transmissão de dados, e assim suprir a exigência por largura de banda. Em redes ópticas, um dos principais avanços é o surgimento da multiplexação de comprimento de onda (WDM). Desta forma, uma questão essencial no projeto de redes ópticas compreende na definição de como a rede será controlada, isto é, qual tipo de sinalização será utilizado para reserva de recursos, definição de rotas, tratamento de falhas, entre outras funções formadoras do plano de controle. Isso implica na necessidade de diversos dispositivos para garantir o bom funcionamento da rede. A diversidade e complexidade de administração desses dispositivos incentivam a criação do GMPLS (Generalized Multiprotocol Label Switching), a fim de prover controle, não somente para domínios baseados em pacotes (como faz o MPLS - Multiprotocol Label Switching), mas também em tempo, comprimento de onda e fibra. Porém, a comutação de rótulos sobre a multiplexação de comprimento de onda pode gerar um problema NP-Completo envolvendo o roteamento e a associação de comprimento de onda, uma vez que se ambas não obtiverem sucesso, ocorrerá o bloqueio da conexão e perda de desempenho da rede. Outra questão relevante é que, em redes totalmente ópticas, existem problemas inerentes da camada física os que influenciam na probabilidade de bloqueio e devem ser levados em consideração em algoritmos RWA (roteamento por associação de comprimento de onda). O presente trabalho realiza o estudo do plano de controle GMPLS e de algoritmos RWA para o estabelecimento de conexões em redes WDM transparentes. Além disso, é feito um estudo de duas restrições da camada física (dispersão por modo de polarização e relação sinal ruído óptica) inserindo-as no algoritmo RWA para diminuir a probabilidade de bloqueio devido a elas. Os resultados mostraram que o algoritmo MostUsed possui melhor desempenho em relação ao BestFit e ao Random quando considerado bloqueio por falta de recursos (lambdas). Além disso, o uso de algoritmos cientes de restrições da camada física influencia significamente na diminuição da probabilidade de bloqueio. Portanto, o melhor desempenho foi observado no uso de algoritmos cientes de restrições físicas juntamente com o algoritmo MostUsed.

The increase in the number of users and the emergence of sophisticated network applications motivate the research to improve the data-communication technologies, and thus to meet the requirement for bandwidth. In optical networks, one of the main advances is wavelength division multiplexing (WDM). An essential issue in designing of optical networks is how the network will be controlled, that is, which type of signaling will be used for resources reservation, routing and wavelength assigning, and how physical impairments will be dealfish. This implies in the necessity of several devices to guarantee the good functioning of the network. The diversity and complexity of administration of these devices stimulate…

Advisors/Committee Members: Luis Carlos Trevelin.

Subjects/Keywords: Redes de computação; Redes de longa distância (Redes de computação); Generalized Multiprotocol Label Switching (GMPLS); Redes ópticas transparentes; WDM; GMPLS e RWA; CIENCIA DA COMPUTACAO; All-optical networks; WDM; GMPLS e RWA

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Feres, M. M. (2009). Estudo de algoritmos RWA em redes GMPLS sobre DWDM. (Thesis). Universidade Federal de São Carlos. Retrieved from http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=3610

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Feres, Mariana Massimino. “Estudo de algoritmos RWA em redes GMPLS sobre DWDM.” 2009. Thesis, Universidade Federal de São Carlos. Accessed April 11, 2021. http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=3610.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Feres, Mariana Massimino. “Estudo de algoritmos RWA em redes GMPLS sobre DWDM.” 2009. Web. 11 Apr 2021.

Vancouver:

Feres MM. Estudo de algoritmos RWA em redes GMPLS sobre DWDM. [Internet] [Thesis]. Universidade Federal de São Carlos; 2009. [cited 2021 Apr 11]. Available from: http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=3610.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Feres MM. Estudo de algoritmos RWA em redes GMPLS sobre DWDM. [Thesis]. Universidade Federal de São Carlos; 2009. Available from: http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=3610

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Georgia Tech

20. Agnew, Amalia. Quantum-Chemical Investigations of Second- and Third-Order Nonlinear Optical Chromophores for Electro-Optic and All-Optical Switching Applications.

Degree: PhD, Chemistry and Biochemistry, 2006, Georgia Tech

URL: http://hdl.handle.net/1853/11575

► The past decades have witnessed the development of new materials with large nonlinear optical properties, which have made them attractive candidats for a broad spectrum… (more)

Subjects/Keywords: Nonlinear optics; Quantum-chemical investigations; Electro-optic; All-optical switching; Nonlinear optics; Quantum chemistry

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APA (6^th Edition):

Agnew, A. (2006). Quantum-Chemical Investigations of Second- and Third-Order Nonlinear Optical Chromophores for Electro-Optic and All-Optical Switching Applications. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/11575

Chicago Manual of Style (16^th Edition):

Agnew, Amalia. “Quantum-Chemical Investigations of Second- and Third-Order Nonlinear Optical Chromophores for Electro-Optic and All-Optical Switching Applications.” 2006. Doctoral Dissertation, Georgia Tech. Accessed April 11, 2021. http://hdl.handle.net/1853/11575.

MLA Handbook (7^th Edition):

Agnew, Amalia. “Quantum-Chemical Investigations of Second- and Third-Order Nonlinear Optical Chromophores for Electro-Optic and All-Optical Switching Applications.” 2006. Web. 11 Apr 2021.

Vancouver:

Agnew A. Quantum-Chemical Investigations of Second- and Third-Order Nonlinear Optical Chromophores for Electro-Optic and All-Optical Switching Applications. [Internet] [Doctoral dissertation]. Georgia Tech; 2006. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1853/11575.

Council of Science Editors:

Agnew A. Quantum-Chemical Investigations of Second- and Third-Order Nonlinear Optical Chromophores for Electro-Optic and All-Optical Switching Applications. [Doctoral Dissertation]. Georgia Tech; 2006. Available from: http://hdl.handle.net/1853/11575

Université de Lorraine

21. Scheid, Philippe. Investigation of light–induced ultrafast magnetization dynamics using ab initio methods : Étude de la dynamique ultrarapide de l’aimantation induite par la lumière selon des méthodes ab initio.

Degree: Docteur es, Physique, 2020, Université de Lorraine

URL: http://www.theses.fr/2020LORR0166

►

Cette thèse commence par une revue de l’état actuel de l’expérimentation et de la théorie liées à la désaimantation ultrarapide induite par de la lumière,… (more)

▼

Cette thèse commence par une revue de l’état actuel de l’expérimentation et de la théorie liées à la désaimantation ultrarapide induite par de la lumière, ainsi qu'au retournement tout optique dépendant de l'hélicité. Ceci est suivi d’un aperçu de la théorie de la fonctionnelle de la densité, sur laquelle repose la plupart des travaux rapportés par la suite. La première partie des résultats concerne l’étude de l’effet d’une élévation de la température électronique sur les propriétés de la matière aimantée, et plus précisément Ni, Co, Fe et FePt. Nous montrons que le moment magnétique de chaque atome disparaı̂t à la température de Stoner, et que, de manière plus générale ce phénomène impacte l’énergie électronique et la chaleur spécifique, même à basse température électronique. Ensuite, nous montrons que lors d’une augmentation de la température électronique, l’échange interatomique d’Heisenberg, responsable de l’ordre magnétique, diminue. En utilisant l’équation de Landau–Lifshitz–Gilbert atomistique, nous démontrons que cette diminution est suffisante pour induire une forte réduction de l’aimantation moyenne en créant des excitations transversales. La deuxième partie des résultats concerne l’origine de la dépendante en l’hélicité de la dynamique induite par la lumière. Alors que la littérature l’attribue principalement à l’effet Faraday inverse, nous soutenons qu’un autre phénomène, se produisant lors de l’absorption de la lumière, peut rendre compte de la dynamique expérimentale. En effet, lorsque la lumière est absorbée et que les électrons sont excités, le couplage spin–orbite permet la modification de l’état de spin. Il en résulte un changement de la valeur des moments magnétiques atomiques, persistant même après la disparition de la lumière, par opposition à l’effet Faraday inverse. Ensuite, en utilisant la théorie de la fonctionnelle de la densité dépendante du temps, nous calculons la dynamique de l’aimantation induite par de véritables impulsions femtosecondes polarisées circulairement dans le domaine optique et XUV. Dans les deux cas, la dynamique est dépendante de l’hélicité. Cette caractéristique est largement amplifiée dans le régime XUV impliquant les états de semi–coeur 3p. Enfin, nous comparons le rôle relatif de l’effet Faraday inverse et de l’aimantation induite lors de l’absorption de la lumière et montrons que cette dernière joue un rôle prépondérant, surtout après la disparition de la lumière et en régime XUV.

This thesis begins with a review of the current experimental and theoretical state of the art related to the light-induced ultrafast demagnetization and the all-optical helicity-dependent switching. This is followed by an overview of density functional theory, upon which relies most of the work reported thereafter. The first set of results concerns the ab initio study of the effect of a rise in the electronic temperature on the magnetized matter properties, and more specifically Fe, Co, Ni and FePt. We show that the magnetic moment carried by each atom disappears at the so–called Stoner…

Advisors/Committee Members: Lebègue, Sébastien (thesis director), Malinowski, Grégory (thesis director).

Subjects/Keywords: Magnétisme; Ab initio; Théorie de la fonctionnelle de la densité; Théorie de la fonctionnelle de la densité dépendante du temps; Désaimantation ultrarapide; Retournement tout-optique; Magnetism; Ab initio; Density functional theory; Time-dependent density functional theory; Ultrafast demagnetization; All-optical switching; 538.3

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Scheid, P. (2020). Investigation of light–induced ultrafast magnetization dynamics using ab initio methods : Étude de la dynamique ultrarapide de l’aimantation induite par la lumière selon des méthodes ab initio. (Doctoral Dissertation). Université de Lorraine. Retrieved from http://www.theses.fr/2020LORR0166

Chicago Manual of Style (16^th Edition):

Scheid, Philippe. “Investigation of light–induced ultrafast magnetization dynamics using ab initio methods : Étude de la dynamique ultrarapide de l’aimantation induite par la lumière selon des méthodes ab initio.” 2020. Doctoral Dissertation, Université de Lorraine. Accessed April 11, 2021. http://www.theses.fr/2020LORR0166.

MLA Handbook (7^th Edition):

Scheid, Philippe. “Investigation of light–induced ultrafast magnetization dynamics using ab initio methods : Étude de la dynamique ultrarapide de l’aimantation induite par la lumière selon des méthodes ab initio.” 2020. Web. 11 Apr 2021.

Vancouver:

Scheid P. Investigation of light–induced ultrafast magnetization dynamics using ab initio methods : Étude de la dynamique ultrarapide de l’aimantation induite par la lumière selon des méthodes ab initio. [Internet] [Doctoral dissertation]. Université de Lorraine; 2020. [cited 2021 Apr 11]. Available from: http://www.theses.fr/2020LORR0166.

Council of Science Editors:

Scheid P. Investigation of light–induced ultrafast magnetization dynamics using ab initio methods : Étude de la dynamique ultrarapide de l’aimantation induite par la lumière selon des méthodes ab initio. [Doctoral Dissertation]. Université de Lorraine; 2020. Available from: http://www.theses.fr/2020LORR0166

22. Μπίντζας, Χρίστος. Αμιγώς οπτική μεταγωγή και δρομολόγηση δεδομένων σε ψηφιακά τηλεπικοινωνιακά δίκτυα.

Degree: 2003, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)

URL: http://hdl.handle.net/10442/hedi/16552

Subjects/Keywords: Οπτικές πηγές; Ημιαγώγιμος οπτικός ενισχυτής; Οπτικοί διακόπτες; Οπτική μεταγωγή; Οπτική δρομολόγηση; Οπτική μεταγωγή πακέτων; Οπτική μνήμη; Ανάκτηση ρολογιού; Εξαγωγή επικεφαλίδας; Αμιγώς οπτικά δίκτυα; Optical sources; Semiconductor optical amplifiers; Optical gates; Optical switching; Optical routing; Optical pocket switching; Optical memory; Clock recovery; Header extraction; All-optical networks

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Μπίντζας, . �. (2003). Αμιγώς οπτική μεταγωγή και δρομολόγηση δεδομένων σε ψηφιακά τηλεπικοινωνιακά δίκτυα. (Thesis). National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Retrieved from http://hdl.handle.net/10442/hedi/16552

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Μπίντζας, Χρίστος. “Αμιγώς οπτική μεταγωγή και δρομολόγηση δεδομένων σε ψηφιακά τηλεπικοινωνιακά δίκτυα.” 2003. Thesis, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Accessed April 11, 2021. http://hdl.handle.net/10442/hedi/16552.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Μπίντζας, Χρίστος. “Αμιγώς οπτική μεταγωγή και δρομολόγηση δεδομένων σε ψηφιακά τηλεπικοινωνιακά δίκτυα.” 2003. Web. 11 Apr 2021.

Vancouver:

Μπίντζας �. Αμιγώς οπτική μεταγωγή και δρομολόγηση δεδομένων σε ψηφιακά τηλεπικοινωνιακά δίκτυα. [Internet] [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2003. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10442/hedi/16552.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Μπίντζας �. Αμιγώς οπτική μεταγωγή και δρομολόγηση δεδομένων σε ψηφιακά τηλεπικοινωνιακά δίκτυα. [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2003. Available from: http://hdl.handle.net/10442/hedi/16552

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

23. Kim, Hyeongeu. Investigation of optical properties of polymethines for potential application in all-optical signal processing.

Degree: PhD, Chemistry and Biochemistry, 2015, Georgia Tech

URL: http://hdl.handle.net/1853/53579

► Demonstration of ultrafast all-optical signal processing (AOSP) using silicon as the active material has been limited by large two-photon absorption loss and long lifetimes of… (more)

▼ Demonstration of ultrafast all-optical signal processing (AOSP) using silicon as the active material has been limited by large two-photon absorption loss and long lifetimes of the resulting free carriers. For AOSP at speeds in the terahertz, an order of magnitude faster than that the fastest current electronic counterpart, a class of π-conjugated organic molecules called polymethines provides a promising alternative to silicon as they possess large third-order nonlinearities, and ultrafast polarization response to an incident field. The challenge in the application of polymethines as active nonlinear optical materials for AOSP is in translating their promising molecular properties into bulk material properties. The large linear polarizability and charged nature of the polymethines molecules strongly promote aggregation and phase-separation in solid blends, offsetting their advantageous molecular optical properties. In this work, polymethines’ resistance to deleterious spontaneous symmetry breaking and aggregation was enhanced by substitutions of metal- and chalcogen- containing terminal groups, and rigid steric groups above and below the π-conjugated plane of polymethine chain. The resulting polymethines/amorphous polycarbonate (APC) blend films demonstrated an unprecedentedly high two-photon figure-of-merit, |Re(χ(3))/Im(χ(3))| and low linear loss. The optical quality of the polymethines/APC films was also improved by replacing the commonly-used alkyl ammonium counterions with more polarizable aryl phosphonium counterions with moderate ground state dipole moment. The resulting dye-polymer blend films showed an enhanced near-infrared transparency while its magnitude of the third-order susceptibility, |χ(3)|, showed a good agreement with that extrapolated from the molecular third-order polarizability, γ. For facile integration of these promising organic materials into SOH, the substrate surface was functionalized using silane coupling chemistry for the reduction of surface energy mismatch between the polymer films and the waveguide containing substrates. The optical and SEM micrographs showed vastly improved coverage and infiltration of the microfeatures. Furthermore, to enable the precise engineering of waveguide cross-sectional dimensions for single-mode propagation in the organic cladding, the dispersion curves of the polymethines/polymer blends were generated using prism coupling and ellipsometry. The combined efforts in the development of molecules and materials discussed in the thesis have culminated into a successful identification and optimization of the polymethines dyes and their polymer blends for imminent demonstrations of on-chip AOSP at terahertz speed. Advisors/Committee Members: Perry, Joseph W. (advisor), Trebino, Rick (committee member), Brown, Kenneth R. (committee member), Dickson, Robert M. (committee member), Wilkinson, Angus P. (committee member).

Subjects/Keywords: Z-scan; Third-order polarizability; Third-order susceptibility; Polymethine; Intensity dependent refractive index; Nonlinear refraction; All-optical signal processing; All-optical switching; Differential phase shift

…Ad adamantyl- AOS all-optical switching AOSP all-optical signal processing BLA bond… …transparency in the telecommucation wavelengths, demonstration of ultrafast all-optical signal… …photon absorption loss and long lifetimes of the resulting free carriers. For all-optical… …optical signal processing (AOSP) device such as an all-optical switch (AOS)… …Finally, all-optical switches serve as a crucial building block for other optical logic elements…

10 more images…

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kim, H. (2015). Investigation of optical properties of polymethines for potential application in all-optical signal processing. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/53579

Chicago Manual of Style (16^th Edition):

Kim, Hyeongeu. “Investigation of optical properties of polymethines for potential application in all-optical signal processing.” 2015. Doctoral Dissertation, Georgia Tech. Accessed April 11, 2021. http://hdl.handle.net/1853/53579.

MLA Handbook (7^th Edition):

Kim, Hyeongeu. “Investigation of optical properties of polymethines for potential application in all-optical signal processing.” 2015. Web. 11 Apr 2021.

Vancouver:

Kim H. Investigation of optical properties of polymethines for potential application in all-optical signal processing. [Internet] [Doctoral dissertation]. Georgia Tech; 2015. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1853/53579.

Council of Science Editors:

Kim H. Investigation of optical properties of polymethines for potential application in all-optical signal processing. [Doctoral Dissertation]. Georgia Tech; 2015. Available from: http://hdl.handle.net/1853/53579

24. Καλύβας, Μάριος. Αμιγώς οπτική ψηφιακή επεξεργασία σήματος σε τηλεπικοινωνιακά δίκτυα με το μη γραμμικό συμβολόμετρο υπερηψηλής ταχύτητας.

Degree: 2003, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)

URL: http://hdl.handle.net/10442/hedi/16580

Subjects/Keywords: Αμιγώς οπτική μεταγωγή; Αμιγώς οπτική επεξεργασία σήματος; Αμιγώς οπτική μεταγωγή πακέτου; Αμιγώς οπτική λογική; Μη γραμμικό συμβολόμετρο υπερυψηλών ταχυτήτων - UNI; Οπτικός ενισχυτής ημιαγωγού; Γραμμικός καταχωρητής ολίσθησης με ανάδραση; Ψευδοτυχαίες δυαδικές ακολουθίες; All optical switching; All optical signal processing; All optical packet switching; All optical logic; Ultrafast non-linear interferometer (UNI); Optical semiconductor amplifier; Linear feedback shift register; Pseudorandom binary sequences

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Καλύβας, . �. (2003). Αμιγώς οπτική ψηφιακή επεξεργασία σήματος σε τηλεπικοινωνιακά δίκτυα με το μη γραμμικό συμβολόμετρο υπερηψηλής ταχύτητας. (Thesis). National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Retrieved from http://hdl.handle.net/10442/hedi/16580

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Καλύβας, Μάριος. “Αμιγώς οπτική ψηφιακή επεξεργασία σήματος σε τηλεπικοινωνιακά δίκτυα με το μη γραμμικό συμβολόμετρο υπερηψηλής ταχύτητας.” 2003. Thesis, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Accessed April 11, 2021. http://hdl.handle.net/10442/hedi/16580.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Καλύβας, Μάριος. “Αμιγώς οπτική ψηφιακή επεξεργασία σήματος σε τηλεπικοινωνιακά δίκτυα με το μη γραμμικό συμβολόμετρο υπερηψηλής ταχύτητας.” 2003. Web. 11 Apr 2021.

Vancouver:

Καλύβας �. Αμιγώς οπτική ψηφιακή επεξεργασία σήματος σε τηλεπικοινωνιακά δίκτυα με το μη γραμμικό συμβολόμετρο υπερηψηλής ταχύτητας. [Internet] [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2003. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10442/hedi/16580.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Καλύβας �. Αμιγώς οπτική ψηφιακή επεξεργασία σήματος σε τηλεπικοινωνιακά δίκτυα με το μη γραμμικό συμβολόμετρο υπερηψηλής ταχύτητας. [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2003. Available from: http://hdl.handle.net/10442/hedi/16580

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

25. Θεοφιλόπουλος, Γεώργιος. Αμιγώς οπτική μεταγωγή πακέτων για ψηφιακά δίκτυα υπερυψηλών ταχυτήτων: πορεία προς την υλοποίηση.

Degree: 2003, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)

URL: http://hdl.handle.net/10442/hedi/16563

Subjects/Keywords: 2*2 διακόπτης μεταγωγής; Οπτική λογική; Μη γραμμική συμπίεση οπτικών παλμών; Μη γραμμικό συμβολόμετρο υπερυψηλών ταχυτήτων - UNI; Αμιγώς οπτικά κυκλώματα; Αμιγώς οπτική μεταγωγή πακέτου; Οπτικός ενισχυτής ημιαγωγού; 2*2 exchange / bypass switch; Optical logic; Non-linear pulse compression; Ultrafast non-linear interferometer (UNI); All-optical circuits; All optical packet switching; Semiconductor optical amplifiers

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Θεοφιλόπουλος, . �. (2003). Αμιγώς οπτική μεταγωγή πακέτων για ψηφιακά δίκτυα υπερυψηλών ταχυτήτων: πορεία προς την υλοποίηση. (Thesis). National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Retrieved from http://hdl.handle.net/10442/hedi/16563

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Θεοφιλόπουλος, Γεώργιος. “Αμιγώς οπτική μεταγωγή πακέτων για ψηφιακά δίκτυα υπερυψηλών ταχυτήτων: πορεία προς την υλοποίηση.” 2003. Thesis, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Accessed April 11, 2021. http://hdl.handle.net/10442/hedi/16563.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Θεοφιλόπουλος, Γεώργιος. “Αμιγώς οπτική μεταγωγή πακέτων για ψηφιακά δίκτυα υπερυψηλών ταχυτήτων: πορεία προς την υλοποίηση.” 2003. Web. 11 Apr 2021.

Vancouver:

Θεοφιλόπουλος �. Αμιγώς οπτική μεταγωγή πακέτων για ψηφιακά δίκτυα υπερυψηλών ταχυτήτων: πορεία προς την υλοποίηση. [Internet] [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2003. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10442/hedi/16563.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Θεοφιλόπουλος �. Αμιγώς οπτική μεταγωγή πακέτων για ψηφιακά δίκτυα υπερυψηλών ταχυτήτων: πορεία προς την υλοποίηση. [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2003. Available from: http://hdl.handle.net/10442/hedi/16563

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Toronto

26. Zilkie, Aaron John. High-speed Properties of 1.55-micron-wavelength Quantum Dot Semiconductor Amplifiers and Comparison with Higher-Dimensional Structures.

Degree: 2008, University of Toronto

URL: http://hdl.handle.net/1807/17265

►

This thesis reports an experimental characterization of the ultrafast gain and refractive index dynamics of a novel InAs/InGaAsP/InP quantum-dot (QD) semiconductor optical amplifier (SOA) operating… (more)

▼

This thesis reports an experimental characterization of the ultrafast gain and refractive index dynamics of a novel InAs/InGaAsP/InP quantum-dot (QD) semiconductor optical amplifier (SOA) operating near 1.55-µm wavelengths, assessing its high-speed performance characteristics for the first time. The thesis also studies the influence of the degree of quantum confinement on the dynamics of SOAs by comparing the zero-dimensional (0-D) QD's dynamics to those in 1-D InAs/InAlGaAs/InP quantum-dash (QDash), and 2-D InGaAsP/InGaAsP/InP quantum-well (QW) SOAs, both of which also operate near 1.55-µm wavelengths, and are made with matching or similar materials and structures. The ultrafast (around 1 ps) and long-lived (up to 2 ns) amplitude and phase dynamics of the SOAs are characterized via advanced heterodyne pump-probe measurements with 150-femtosecond resolution. It is found that the QD SOA has an 80-picosecond amplitude, and 110-picosecond phase recovery lifetime in the gain regime, 4-6 times faster than the QDash and QW recovery lifetimes, as well as reduced ultrafast transients, giving it the best properties for high-speed (> 100 Gb/s) all-optical signal processing in the important telecommunications wavelength bands. An impulse response model is developed and used to analyze the dynamics, facilitating a comparison of the gain compression factors, time-resolved linewidth enhancement factors (alpha-factors), and instantaneous dynamic coefficients (two-photon absorption and nonlinear refractive-index coefficients) amongst the three structures. The quantum-dot device is found to have the lowest effective alpha-factor, 2-10, compared to 8-16 in the QW, as well as time-resolved alpha-factors lower than in the QW—promising for reduced-phase-transient operation at high bitrates. Significant differences in the alpha-factors of lasers with the same structure are found, due to the differences between gain changes that are induced optically or through the electrical bias. The relative contributions of stimulated transitions and free-carrier absorption to the total carrier heating dynamics in SOAs of varying dimensionality are also reported for the first time. Examining the QD electroluminescence and linear gain spectra in combination with the carrier dynamics also brings about conclusions on the nature of the quantum confinement, dot energy-level structure, and density of states—aspects of the material that have not been previously well understood.

PhD

Advisors/Committee Members: Aitchison, J. Stewart, Smith, Peter W. E., Electrical and Computer Engineering.

Subjects/Keywords: quantum dot; semiconductor optical amplifiers; all-optical switching; semiconductor nonlinear dynamics; semiconductor lasers; nonlinear optics; semiconductor physics; linewidth enhancement factor; two-photon absorption; quantum well; quantum dash; ultrafast lasers; optical signal processing; 0544

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zilkie, A. J. (2008). High-speed Properties of 1.55-micron-wavelength Quantum Dot Semiconductor Amplifiers and Comparison with Higher-Dimensional Structures. (Doctoral Dissertation). University of Toronto. Retrieved from http://hdl.handle.net/1807/17265

Chicago Manual of Style (16^th Edition):

Zilkie, Aaron John. “High-speed Properties of 1.55-micron-wavelength Quantum Dot Semiconductor Amplifiers and Comparison with Higher-Dimensional Structures.” 2008. Doctoral Dissertation, University of Toronto. Accessed April 11, 2021. http://hdl.handle.net/1807/17265.

MLA Handbook (7^th Edition):

Zilkie, Aaron John. “High-speed Properties of 1.55-micron-wavelength Quantum Dot Semiconductor Amplifiers and Comparison with Higher-Dimensional Structures.” 2008. Web. 11 Apr 2021.

Vancouver:

Zilkie AJ. High-speed Properties of 1.55-micron-wavelength Quantum Dot Semiconductor Amplifiers and Comparison with Higher-Dimensional Structures. [Internet] [Doctoral dissertation]. University of Toronto; 2008. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1807/17265.

Council of Science Editors:

Zilkie AJ. High-speed Properties of 1.55-micron-wavelength Quantum Dot Semiconductor Amplifiers and Comparison with Higher-Dimensional Structures. [Doctoral Dissertation]. University of Toronto; 2008. Available from: http://hdl.handle.net/1807/17265

27. Λαλλάς, Ευθύμιος. Μελέτη νέας μεθόδου σηματοδοσίας φυσικού επιπέδου για δίκτυο οπτικής μεταγωγής πακέτου.

Degree: 2007, National and Kapodistrian University of Athens; Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ)

URL: http://hdl.handle.net/10442/hedi/23015

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In this thesis, an orthogonal modulation scheme, for the label encoding onto the intensity modulated payload is studied for the first time as well as… (more)

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In this thesis, an orthogonal modulation scheme, for the label encoding onto the intensity modulated payload is studied for the first time as well as the all optical label swapping (AOLS) technique, via extensive simulation of a network system where the abovementioned functions are taken place. The first part of the thesis includes references to all existing data switching technologies (circuit, packet and burst switching) and a description of MPLS protocol and all of its succeeded versions (GMPLS, MPλS), up to all optical label swapping (AOLS). Moreover an extensive description of all current label modulation and encoding schemes onto payload of the IP packet is included in this part as well. In the second part of the thesis the IM/FSK orthogonal modulation scheme is analyzed for the first time including all the models required for the implementation of the AOLS network system. The all optical orthogonal label encoding onto packet and the all optical label swapping functions are based on the four wave mixing technique (FWM) and the cross phase modulation technique (XPM) respectively, both implemented via semiconductor optical amplifier devices (SOA). In the last chapter a numerical analysis by extensive simulation measurements is carried out, seeking for the optimization of a wide range of critical parameters as well as the limits of the AOLS network system.

Η διατριβή βασίζεται στη θεωρητική μελέτη της ορθογώνιας μεθόδου κωδικοποίησης και της διαδικασίας αμιγούς οπτικής ανταλλαγής ετικέτας των πακέτων, και την προσομοίωση ενός συστήματος οπτικής δικτυακής διάταξης κόμβων, όπου λαμβάνουν χώρα οι προαναφερθέντες λειτουργίες. Στο πρώτο μέρος γίνεται μία αναφορά στις επικρατέστερες τεχνολογίες μεταγωγής δεδομένων (μεταγωγή κυκλώματος πακέτων, και ριπής), και παρουσιάζεται το πολυπρωτόκολλο MPLS και όλες οι εξελικτικές εκδοχές αυτού (GMPLS, ΜΡλS), για να καταλήξουμε στην αμιγώς οπτική ανταλλαγή ετικέτας πακέτου (AOLS). Επίσης παρατίθενται όλα τα σχήματα κωδικοποίησης και ενσωμάτωσης της οπτικής ετικέτας στο IP πακέτο, και εξετάζονται όλες τις τεχνικές υλοποίησης σε επίπεδο κόμβων και διατάξεων. Στο δεύτερο μέρος αναλύεται για πρώτη φορά στη βιβλιογραφία το IM/FSK ορθογώνιο σχήμα και παρουσιάζονται όλα τα θεωρητικά μοντέλα που υποστηρίζουν και υλοποιούν το σύστημα οπτικής δικτυακής διάταξης κόμβων, όπου λαμβάνουν χώρα η ορθογώνια κωδικοποίηση και η διαδικασία αμιγούς οπτικής ανταλλαγής ετικέτας των πακέτων. Οι παραπάνω λειτουργίες γίνονται αμιγώς οπτικά και βασίζονται στην τεχνική μίξης τεσσάρων κυμάτων (FWM) και στην τεχνική ετεροδιαμόρφωσης φάσης (ΧΡΜ) αντίστοιχα, υλοποιημένων σε διάταξη ημιαγωγού (SOA). Στο τελευταίο κεφάλαιο παραθέτονται τα αποτελέσματα μίας λεπτομερούς αριθμητικής ανάλυσης που πραγματοποιήθηκε με την προσομοίωση της δικτυακής AOLS διάταξης, και γίνεται μία διερεύνηση για τη βελτιστοποίηση των τιμών των κρίσιμων παραμέτρων της μεθόδου, ενώ παράλληλα εξετάζονται και τα όρια επίδοσης αυτής.

Subjects/Keywords: Αμιγώς οπτική ανταλλαγή ετικέτας; Ετεροδιαμόρφωση φάσης; Μίξη τεσσάρων κυμάτων; Μεταγωγή πακέτων; Πολυπρωτόκολλο μεταγωγής πακέτου; Μεταγωγή κυκλωμάτων; Μεταγωγή ριπής; Ετεροδιαμόρφωση απολαβής; All optical label swapping; Cross phase modulation; Four wave mixing; Packet switching; Multiprotocol label switching; Circuit switching; Burst switching; Cross gain modulation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Λαλλάς, . �. (2007). Μελέτη νέας μεθόδου σηματοδοσίας φυσικού επιπέδου για δίκτυο οπτικής μεταγωγής πακέτου. (Thesis). National and Kapodistrian University of Athens; Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ). Retrieved from http://hdl.handle.net/10442/hedi/23015

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Λαλλάς, Ευθύμιος. “Μελέτη νέας μεθόδου σηματοδοσίας φυσικού επιπέδου για δίκτυο οπτικής μεταγωγής πακέτου.” 2007. Thesis, National and Kapodistrian University of Athens; Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ). Accessed April 11, 2021. http://hdl.handle.net/10442/hedi/23015.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Λαλλάς, Ευθύμιος. “Μελέτη νέας μεθόδου σηματοδοσίας φυσικού επιπέδου για δίκτυο οπτικής μεταγωγής πακέτου.” 2007. Web. 11 Apr 2021.

Vancouver:

Λαλλάς �. Μελέτη νέας μεθόδου σηματοδοσίας φυσικού επιπέδου για δίκτυο οπτικής μεταγωγής πακέτου. [Internet] [Thesis]. National and Kapodistrian University of Athens; Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ); 2007. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10442/hedi/23015.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Λαλλάς �. Μελέτη νέας μεθόδου σηματοδοσίας φυσικού επιπέδου για δίκτυο οπτικής μεταγωγής πακέτου. [Thesis]. National and Kapodistrian University of Athens; Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ); 2007. Available from: http://hdl.handle.net/10442/hedi/23015

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

28. Maziotis, Alexandros. Ανάπτυξη φωτονικών συστημάτων για εφαρμογή σε ευρυζωνικά οπτικά δίκτυα πρόσβασης νέας γενιάς.

Degree: 2012, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)

URL: http://hdl.handle.net/10442/hedi/39992

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The objective of the present PhD thesis is the development of techniques and subsystems adapted to the requirements of next generation optical access networks. Within… (more)

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The objective of the present PhD thesis is the development of techniques and subsystems adapted to the requirements of next generation optical access networks. Within this framework, the thesis focuses on the study, development and experimental demonstration of novel solutions regarding the design of customer premises, data transmission between users and user mobility. The implementations span over a wide range and contribute greatly to the fulfillment of next-generation photonic networks, since they are optimized in terms of transmission performance, energy efficiency, cost and integration capability. An all-optical carrier recovery technique, based on a passive resonating circuit for wavelength reuse and remodulation, in loopback access networks is demonstrated. The technique is applied in WDM-PONs with RSOA-based optical network units (ONU), showing that it is efficient and flexible to be applied to different downstream signals (non-/chirped ASK and multilevel signals) with full-duplex high data rate transmission. Moreover, a colorless ONU comprised of a Fabry–Pérot filter (FPF) and a semiconductor optical amplifier (SOA) for all-optical clock recovery of the downstream signal is proposed, which allows wavelength reuse of the downstream signal for upstream remodulation, achieving full-duplex 10 Gb/s symmetrical data rate with extended reach. This technique is further used to avoid in-band Rayleigh backscattering through wavelength shifting. Furthermore, a technique for optical intra-network data transmission between different users, through cognitive wavelength routing, in metro-access networks is presented. Finally, in radio-over-fiber networks, an optical dynamic capacity allocation scheme for handoff, using moving extended cells, is demonstrated and also a technique of optical frequency multiplication, for delivery of wireless heterogeneous services over a single optical carrier to two users, is proposed.

Σκοπός της παρούσας διατριβής είναι η ανάπτυξη τεχνικών και υποσυστημάτων προσαρμοσμένων στις απαιτήσεις των οπτικών δικτύων πρόσβασης νέας γενιάς. Σε αυτό το πλαίσιο, η διατριβή εστιάζει στη μελέτη, ανάπτυξη και πειραματική υλοποίηση πρωτότυπων λύσεων στη σχεδίαση των δομών του χρήστη, τη μετάδοση δεδομένων ανάμεσα στους χρήστες και την κινητικότητά τους. Οι υλοποιήσεις καλύπτουν μεγάλο εύρος και συνεισφέρουν σημαντικά στην ανάπτυξη φωτονικών δικτύων πρόσβασης νέας γενιάς, καθώς είναι βελτιστοποιημένες όσον αφορά την επίδοση μετάδοσης, την ενεργειακή αποδοτικότητα, το κόστος και τη δυνατότητα ολοκλήρωσής τους. Πιο συγκεκριμένα, παρουσιάζεται μία τεχνική αμιγώς οπτικής ανάκτησης φέρουσας βασισμένη σε παθητικό οπτικό φιλτράρισμα, για επαναχρησιμοποίηση μήκους κύματος και επαναδιαμόρφωση σε δίκτυα πρόσβασης. Η τεχνική εφαρμόζεται σε πλήρως αμφίδρομα δίκτυα πολυπλεξίας μήκους κύματος, με μονάδες οπτικού δικτύου που βασίζονται σε ημιαγώγιμους ανακλαστικούς οπτικούς ενισχυτές, ενώ αποδεικνύεται ότι είναι κατάλληλη για εφαρμογή σε διαφορετικού τύπου συρρευματικά σήματα, επιδεικνύοντας υψηλό ρυθμό μετάδοσης…

Subjects/Keywords: Δίκτυα πρόσβασης; Παθητικά οπτικά δίκτυα; Κέντρο μεταγωγής; Επαναχρησιμοποίηση μήκους κύματος; Ανάκτηση φέρουσας; Φίλτρο Fabry-Pérot; Μονάδα οπτικού δικτύου (ONU); Τερματικό οπτικών γραμμών (OLT); Ημιαγώγιμοι ανακλαστικοί οπτικοί ενισχυτές; Ψευδοτυχαία ακολουθία δυφίων (PRBS); Τρέμουλο φάσης (chirp); Πολυπλεξία μήκους κύματος; Ανάκτηση ρολογιού; Μετατόπιση μήκους κύματος; Οπισθοσκέδαση Rayleigh; Αμιγώς οπτική μεταγωγή; Δρομολόγηση; Οπτικές μονάδες μνήμης; Οπτικές συσκευές μεταγωγής; Υβριδικά ασύρματα-οπτικά δίκτυα (radio-over-fiber); Πικο-κυψελοειδή δίκτυα; Μικρο-ηλεκτρο-μηχανικός διακόπτης (MEMS); Προβιβασμός συχνότητας; Υποβιβασμός συχνότητας; Δυναμική ανάθεση χωρητικότητας; Μεταπομπή; Οπτικός πολλαπλασιασμός συχνότητας; Access networks; Passive optical networks; Central office; Wavelength reuse; Carrier recovery; Fabry-Pérot filter; Optical network unit; Optical line terminal; Reflective semiconductor optical amplifier; Pseudo random binary sequence; Chirp; Wavelength division multiplexing; Clock recovery; Wavelength shifting; Rayleigh backscattering; All-optical switching; Routing; Optical flip-flop; Optical switching devices; Radio-over-fiber; Picocellular networks; Micro-electro-mechanical switch; Frequency up-conversion; Frequency down-conversion; Dynamic capacity allocation; Handoff; Optical frequency multiplication

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Maziotis, A. (2012). Ανάπτυξη φωτονικών συστημάτων για εφαρμογή σε ευρυζωνικά οπτικά δίκτυα πρόσβασης νέας γενιάς. (Thesis). National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Retrieved from http://hdl.handle.net/10442/hedi/39992

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Maziotis, Alexandros. “Ανάπτυξη φωτονικών συστημάτων για εφαρμογή σε ευρυζωνικά οπτικά δίκτυα πρόσβασης νέας γενιάς.” 2012. Thesis, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Accessed April 11, 2021. http://hdl.handle.net/10442/hedi/39992.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Maziotis, Alexandros. “Ανάπτυξη φωτονικών συστημάτων για εφαρμογή σε ευρυζωνικά οπτικά δίκτυα πρόσβασης νέας γενιάς.” 2012. Web. 11 Apr 2021.

Vancouver:

Maziotis A. Ανάπτυξη φωτονικών συστημάτων για εφαρμογή σε ευρυζωνικά οπτικά δίκτυα πρόσβασης νέας γενιάς. [Internet] [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2012. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10442/hedi/39992.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Maziotis A. Ανάπτυξη φωτονικών συστημάτων για εφαρμογή σε ευρυζωνικά οπτικά δίκτυα πρόσβασης νέας γενιάς. [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2012. Available from: http://hdl.handle.net/10442/hedi/39992

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

29. Teran, Natasha Bugna. Customized conjugation: Tailored Π-systems for organic electronic applications.

Degree: PhD, Chemistry and Biochemistry, 2015, Georgia Tech

URL: http://hdl.handle.net/1853/56189

► The versatility of the conjugated π-system allows it to be structurally tailored and imbued with properties relevant for organic electronics. Judicious selection of synthons and… (more)

Subjects/Keywords: Conjugated pi-system; Organic electronics; Triphenylene; OLED; Host materials; Charge transport; Donor-acceptor; TICT; Nonlinear optics; Third-order polarizability; All-optical switching; Electrochromics; Polaron; Bipolaron; Pi-dimer

…Optical absorption spectra of all chromophores (a) and PMe3TC6(CN)2 (b… …CN)2 (d). 149 Figure 4.11: Optical absorption spectra of all chromophores in… …photovoltaics, light emitting diodes, electrochromic displays, optical switching, and others. As… …Electrode (OTTLE) 39 2.3.2.3. Spectroelectrochemistry on Films 41 2.3.3. Optical… …Dependent NMR Spectroscopy and Optical Absorption Spectroscopy 139 4.5.2.2.1. Solvent-Dependent…

11 more images…

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Teran, N. B. (2015). Customized conjugation: Tailored Π-systems for organic electronic applications. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/56189

Chicago Manual of Style (16^th Edition):

Teran, Natasha Bugna. “Customized conjugation: Tailored Π-systems for organic electronic applications.” 2015. Doctoral Dissertation, Georgia Tech. Accessed April 11, 2021. http://hdl.handle.net/1853/56189.

MLA Handbook (7^th Edition):

Teran, Natasha Bugna. “Customized conjugation: Tailored Π-systems for organic electronic applications.” 2015. Web. 11 Apr 2021.

Vancouver:

Teran NB. Customized conjugation: Tailored Π-systems for organic electronic applications. [Internet] [Doctoral dissertation]. Georgia Tech; 2015. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1853/56189.

Council of Science Editors:

Teran NB. Customized conjugation: Tailored Π-systems for organic electronic applications. [Doctoral Dissertation]. Georgia Tech; 2015. Available from: http://hdl.handle.net/1853/56189

30. Feres, Mariana Massimino. Estudo de algoritmos RWA em redes GMPLS sobre DWDM.

Degree: 2009, Universidade Federal de São Carlos; Programa de Pós-Graduação em Ciência da Computação – PPGCC; UFSCar; BR

URL: https://repositorio.ufscar.br/handle/ufscar/442

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Financiadora de Estudos e Projetos

The increase in the number of users and the emergence of sophisticated network applications motivate the research to improve the… (more)

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Financiadora de Estudos e Projetos

The increase in the number of users and the emergence of sophisticated network applications motivate the research to improve the data-communication technologies, and thus to meet the requirement for bandwidth. In optical networks, one of the main advances is wavelength division multiplexing (WDM). An essential issue in designing of optical networks is how the network will be controlled, that is, which type of signaling will be used for resources reservation, routing and wavelength assigning, and how physical impairments will be dealfish. This implies in the necessity of several devices to guarantee the good functioning of the network. The diversity and complexity of administration of these devices stimulate the creation of GMPLS (Generalized Multiprotocol Label Switching), in order to provide control, for domains not only based on packages (as it makes the MPLS - Multiprotocol Label Switching), but also on time slots, wavelength and fiber. However, the labels switching on the wavelength multiplexing can generate a NP-complete problem involving the routing and wavelength assignment: if both do no succeed, the connection blocking will occur with and loss of network performance. Another relevant question is that, in all-optical networks, there is some physical impairment that influence the blocking probability e must be taken in consideration in algorithms RWA. This work presents the study of the control plan GMPLS and RWA algorithms for the setting up of connections in alloptical WDM networks. Moreover, the study of two physical impairments (polarization mode dispersion and optical signal noise rate) was done, inserting them in RWA algorithm to reduce the blocking probability due them. The results had shown that the MostUsed algorithm has better performance than the BestFit and the Random one when considered the connection blocking due to resources (lambdas). Moreover, the use of impairments-aware algorithms influence significantly in the reduction of the blocking probability. Therefore, the more advantageous performance was observed in the use of impairment-aware algorithms simultaneously with the MostUsed algorithm.

O aumento de usuários e o surgimento de aplicações de redes sofisticadas impulsionam as pesquisas para aprimorar as tecnologias de transmissão de dados, e assim suprir a exigência por largura de banda. Em redes ópticas, um dos principais avanços é o surgimento da multiplexação de comprimento de onda (WDM). Desta forma, uma questão essencial no projeto de redes ópticas compreende na definição de como a rede será controlada, isto é, qual tipo de sinalização será utilizado para reserva de recursos, definição de rotas, tratamento de falhas, entre outras funções formadoras do plano de controle. Isso implica na necessidade de diversos dispositivos para garantir o bom funcionamento da rede. A diversidade e complexidade de administração desses dispositivos incentivam a criação do GMPLS (Generalized Multiprotocol Label Switching), a fim de prover controle, não somente para…

Advisors/Committee Members: Trevelin, Luis Carlos.

Subjects/Keywords: Redes de computação; Redes de longa distância (Redes de computação); Generalized Multiprotocol Label Switching (GMPLS); Redes ópticas transparentes; WDM; GMPLS e RWA; All-optical networks; WDM; GMPLS e RWA; CIENCIAS EXATAS E DA TERRA::CIENCIA DA COMPUTACAO

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Feres, M. M. (2009). Estudo de algoritmos RWA em redes GMPLS sobre DWDM. (Masters Thesis). Universidade Federal de São Carlos; Programa de Pós-Graduação em Ciência da Computação – PPGCC; UFSCar; BR. Retrieved from https://repositorio.ufscar.br/handle/ufscar/442

Chicago Manual of Style (16^th Edition):

Feres, Mariana Massimino. “Estudo de algoritmos RWA em redes GMPLS sobre DWDM.” 2009. Masters Thesis, Universidade Federal de São Carlos; Programa de Pós-Graduação em Ciência da Computação – PPGCC; UFSCar; BR. Accessed April 11, 2021. https://repositorio.ufscar.br/handle/ufscar/442.

MLA Handbook (7^th Edition):

Feres, Mariana Massimino. “Estudo de algoritmos RWA em redes GMPLS sobre DWDM.” 2009. Web. 11 Apr 2021.

Vancouver:

Feres MM. Estudo de algoritmos RWA em redes GMPLS sobre DWDM. [Internet] [Masters thesis]. Universidade Federal de São Carlos; Programa de Pós-Graduação em Ciência da Computação – PPGCC; UFSCar; BR; 2009. [cited 2021 Apr 11]. Available from: https://repositorio.ufscar.br/handle/ufscar/442.

Council of Science Editors:

Feres MM. Estudo de algoritmos RWA em redes GMPLS sobre DWDM. [Masters Thesis]. Universidade Federal de São Carlos; Programa de Pós-Graduação em Ciência da Computação – PPGCC; UFSCar; BR; 2009. Available from: https://repositorio.ufscar.br/handle/ufscar/442

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